adds straightforward localization

src/main/java/cz/muni/fi/pv168/project/data/category/Category.java

@@ -79,6 +79,7 @@ public class Category implements Identifiable {
         timeSpents.removeIf(categoryTime -> categoryTime.getTaskId().equals(taskId));
     }
 
+    //TODO: add support for language structures in localization
     private PeriodFormatter createFormatter() {
         return new PeriodFormatterBuilder()
                 .appendDays()

src/main/java/cz/muni/fi/pv168/project/data/task/TaskStatus.java

@@ -11,6 +11,7 @@ public enum TaskStatus {
     @Override
     public String toString() {
         String value = this.name().replace("_", " ");
+        //TODO: solve hardcoded locale of root
         return value.charAt(0) + value.substring(1).toLowerCase(Locale.ROOT);
     }
 

src/main/java/cz/muni/fi/pv168/project/model/CategoryStatisticsTableModel.java

 package cz.muni.fi.pv168.project.model;
 
 import cz.muni.fi.pv168.project.data.category.Category;
+import cz.muni.fi.pv168.project.ui.i18n.I18N;
 
 import javax.swing.ListModel;
 import javax.swing.event.ListDataEvent;
@@ -13,6 +14,8 @@ public class CategoryStatisticsTableModel extends AbstractTableModel implements
     private LocalDate fromDate;
     private LocalDate toDate;
 
+    private static final I18N I18N = new I18N(CategoryStatisticsTableModel.class);
+
     public CategoryStatisticsTableModel(ListModel<Category> model) {
         fromDate = LocalDate.now();
         toDate = LocalDate.now();
@@ -48,9 +51,9 @@ public class CategoryStatisticsTableModel extends AbstractTableModel implements
     public String getColumnName(int columnIndex) {
         switch (columnIndex) {
             case 0:
-                return "Category name";
+                return I18N.getString("columnNameTitle");
             case 1:
-                return "Time spent";
+                return I18N.getString("columnTimeTitle");
             default:
                 throw new IndexOutOfBoundsException("Invalid column index: " + columnIndex);
         }

src/main/java/cz/muni/fi/pv168/project/model/db/AbstractDataModel.java

@@ -2,18 +2,21 @@ package cz.muni.fi.pv168.project.model.db;
 
 import cz.muni.fi.pv168.project.model.EditableModel;
 import cz.muni.fi.pv168.project.ui.dialog.error.ErrorDialog;
+import cz.muni.fi.pv168.project.ui.i18n.I18N;
 
 import javax.swing.DefaultListModel;
 
 public abstract class AbstractDataModel<E> extends DefaultListModel<E> implements EditableModel<E> {
 
+    private static final I18N I18N = new I18N(AbstractDataModel.class);
+
     @Override
     public void setElementAt(E element, int index) {
         try {
             update(element);
         } catch (Exception e) {
             e.printStackTrace();
-            ErrorDialog.show("Error when editing " + element, e);
+            ErrorDialog.show(I18N.getString("editingEntError") + " " + element, e);
         }
         super.setElementAt(element, index);
     }
@@ -24,7 +27,7 @@ public abstract class AbstractDataModel<E> extends DefaultListModel<E> implement
             add(element);
         } catch (Exception e) {
             e.printStackTrace();
-            ErrorDialog.show("Error when adding " + element, e);
+            ErrorDialog.show(I18N.getString("addingEntError") + " " + element, e);
         }
 
         super.addElement(element);
@@ -37,7 +40,7 @@ public abstract class AbstractDataModel<E> extends DefaultListModel<E> implement
             delete((E) obj);
         } catch (Exception e) {
             e.printStackTrace();
-            ErrorDialog.show("Error when removing " + obj, e);
+            ErrorDialog.show(I18N.getString("deletingEntError") + " " + obj, e);
         }
         return super.removeElement(obj);
     }

src/main/java/cz/muni/fi/pv168/project/model/db/TaskModel.java

@@ -4,12 +4,15 @@ import cz.muni.fi.pv168.project.data.task.Task;
 import cz.muni.fi.pv168.project.db.DataAccessException;
 import cz.muni.fi.pv168.project.db.interfaces.DataAccessObject;
 import cz.muni.fi.pv168.project.ui.dialog.error.ErrorDialog;
+import cz.muni.fi.pv168.project.ui.i18n.I18N;
 
 import java.util.ArrayList;
 import java.util.function.Predicate;
 
 public class TaskModel extends UpdatableDataModel<Task> {
 
+    private static final I18N I18N = new I18N(TaskModel.class);
+
     public TaskModel(DataAccessObject<Task> dao) {
         super(dao);
     }
@@ -26,7 +29,7 @@ public class TaskModel extends UpdatableDataModel<Task> {
             addAll(tasks);
         } catch (DataAccessException e) {
             e.printStackTrace();
-            ErrorDialog.show("Error when querying all elements.", e);
+            ErrorDialog.show(I18N.getString("queryAllError"), e);
         }
     }
 }

src/main/java/cz/muni/fi/pv168/project/model/db/UpdatableDataModel.java

@@ -2,11 +2,14 @@ package cz.muni.fi.pv168.project.model.db;
 
 import cz.muni.fi.pv168.project.db.interfaces.DataAccessObject;
 import cz.muni.fi.pv168.project.ui.dialog.error.ErrorDialog;
+import cz.muni.fi.pv168.project.ui.i18n.I18N;
 
 public class UpdatableDataModel<E> extends AbstractDataModel<E> {
 
     protected final DataAccessObject<E> dataAccessObject;
 
+    private static final I18N I18N = new I18N(UpdatableDataModel.class);
+
     public UpdatableDataModel(DataAccessObject<E> dao) {
         this.dataAccessObject = dao;
         updateAll();
@@ -33,7 +36,7 @@ public class UpdatableDataModel<E> extends AbstractDataModel<E> {
             addAll(dataAccessObject.getAll());
         } catch (Exception e) {
             e.printStackTrace();
-            ErrorDialog.show("Error when querying all elements.", e);
+            ErrorDialog.show(I18N.getString("queryAllError"), e);
         }
     }
 }

src/main/java/cz/muni/fi/pv168/project/ui/action/AddAction.java

 package cz.muni.fi.pv168.project.ui.action;
 
+import cz.muni.fi.pv168.project.ui.i18n.I18N;
 import cz.muni.fi.pv168.project.ui.main.tab.ListHolder;
 
 import javax.swing.Icon;
@@ -9,10 +10,12 @@ import java.awt.event.KeyEvent;
 
 public final class AddAction<T> extends AbstractAction<T> {
 
+    private static final I18N I18N = new I18N(AddAction.class);
+
     public AddAction(ListHolder<T> listHolder, Icon icon, String description) {
         super(listHolder, selectedRowsCount -> true);
 
-        putValue(NAME, "Add");
+        putValue(NAME, I18N.getString("addAction"));
         putValue(SMALL_ICON, icon);
         putValue(SHORT_DESCRIPTION, description);
         putValue(MNEMONIC_KEY, KeyEvent.VK_A);
@@ -23,7 +26,7 @@ public final class AddAction<T> extends AbstractAction<T> {
     public void actionPerformed(ActionEvent e) {
         var maybeResult = getDialogFactory()
                 .newAddDialog()
-                .show("Add");
+                .show(I18N.getString("addAction"));
 
         maybeResult.ifPresent(t -> {
             listHolder.getModel().addElement(t);

src/main/java/cz/muni/fi/pv168/project/ui/action/DeleteAction.java

 package cz.muni.fi.pv168.project.ui.action;
 
+import cz.muni.fi.pv168.project.ui.i18n.I18N;
 import cz.muni.fi.pv168.project.ui.main.tab.ListHolder;
 
 import javax.swing.Icon;
@@ -12,10 +13,12 @@ import java.util.List;
 
 public final class DeleteAction<T> extends AbstractAction<T> {
 
+    private static final I18N I18N = new I18N(DeleteAction.class);
+
     public DeleteAction(ListHolder<T> listHolder, Icon icon, String description) {
         super(listHolder, selectedRowsCount -> selectedRowsCount >= 1);
 
-        putValue(NAME, "Delete");
+        putValue(NAME, I18N.getString("deleteAction"));
         putValue(SMALL_ICON, icon);
         putValue(SHORT_DESCRIPTION, description);
         putValue(MNEMONIC_KEY, KeyEvent.VK_D);
@@ -24,7 +27,7 @@ public final class DeleteAction<T> extends AbstractAction<T> {
 
     @Override
     public void actionPerformed(ActionEvent e) {
-        int result = JOptionPane.showConfirmDialog(listHolder.getList(), "Are you sure you want to delete?");
+        int result = JOptionPane.showConfirmDialog(listHolder.getList(), I18N.getString("confirmation"));
         if (result != JOptionPane.OK_OPTION) {
             return;
         }

src/main/java/cz/muni/fi/pv168/project/ui/action/EditAction.java

 package cz.muni.fi.pv168.project.ui.action;
 
 import cz.muni.fi.pv168.project.data.task.Task;
+import cz.muni.fi.pv168.project.ui.i18n.I18N;
 import cz.muni.fi.pv168.project.ui.main.tab.ListHolder;
 import org.jetbrains.annotations.Nullable;
 
@@ -13,10 +14,11 @@ import java.util.function.Supplier;
 
 public final class EditAction<T> extends AbstractAction<T> {
 
+    private static final cz.muni.fi.pv168.project.ui.i18n.I18N I18N = new I18N(EditAction.class);
     public EditAction(ListHolder<T> listHolder, Icon icon, String description, @Nullable Supplier<Task> taskSupplier) {
         super(listHolder, selectedRowsCount -> selectedRowsCount == 1, taskSupplier);
 
-        putValue(NAME, "Edit");
+        putValue(NAME, I18N.getString("editAction"));
         putValue(SMALL_ICON, icon);
         putValue(SHORT_DESCRIPTION, description);
         putValue(MNEMONIC_KEY, KeyEvent.VK_E);
@@ -38,7 +40,7 @@ public final class EditAction<T> extends AbstractAction<T> {
 
         var maybeResult = getDialogFactory()
                 .newEditDialog(list.getSelectedValue())
-                .show("Edit");
+                .show(I18N.getString("editAction"));
 
         maybeResult.ifPresent(t -> {
             listHolder.getModel().setElementAt(t, listHolder.getModel().indexOf(t));

src/main/java/cz/muni/fi/pv168/project/ui/action/task/GoToAction.java

@@ -2,6 +2,7 @@ package cz.muni.fi.pv168.project.ui.action.task;
 
 import cz.muni.fi.pv168.project.data.task.Task;
 import cz.muni.fi.pv168.project.ui.action.AbstractAction;
+import cz.muni.fi.pv168.project.ui.i18n.I18N;
 import cz.muni.fi.pv168.project.ui.main.tab.ListHolder;
 
 import javax.swing.JList;
@@ -13,12 +14,13 @@ import java.util.List;
 public final class GoToAction extends AbstractAction<Task> {
 
     private final JList<Task> destinationList;
+    private static final I18N I18N = new I18N(GoToAction.class);
 
     public GoToAction(ListHolder<Task> sourceListHolder, JList<Task> destinationList, String description) {
         super(sourceListHolder, selectedRowsCount -> selectedRowsCount == 1);
         this.destinationList = destinationList;
 
-        putValue(NAME, "Go to task");
+        putValue(NAME, I18N.getString("goTo"));
         putValue(SHORT_DESCRIPTION, description);
         putValue(MNEMONIC_KEY, KeyEvent.VK_G);
         putValue(ACCELERATOR_KEY, KeyStroke.getKeyStroke("ctrl G"));

src/main/java/cz/muni/fi/pv168/project/ui/action/task/ToggleCompletionAction.java

@@ -3,6 +3,7 @@ package cz.muni.fi.pv168.project.ui.action.task;
 import cz.muni.fi.pv168.project.data.task.ITask;
 import cz.muni.fi.pv168.project.data.task.Task;
 import cz.muni.fi.pv168.project.ui.action.AbstractAction;
+import cz.muni.fi.pv168.project.ui.i18n.I18N;
 import cz.muni.fi.pv168.project.ui.main.tab.ListHolder;
 import org.jetbrains.annotations.Nullable;
 
@@ -14,10 +15,12 @@ import java.util.function.Supplier;
 
 public class ToggleCompletionAction<T extends ITask> extends AbstractAction<T> {
 
+    private static final I18N I18N = new I18N(ToggleCompletionAction.class);
+
     public ToggleCompletionAction(ListHolder<T> listHolder, String description, @Nullable Supplier<Task> taskSupplier) {
         super(listHolder, selectedRowsCount -> selectedRowsCount == 1, taskSupplier);
 
-        putValue(NAME, "Toggle completion");
+        putValue(NAME, I18N.getString("toggleAction"));
         putValue(SHORT_DESCRIPTION, description);
         putValue(MNEMONIC_KEY, KeyEvent.VK_T);
         putValue(ACCELERATOR_KEY, KeyStroke.getKeyStroke("ctrl T"));

src/main/java/cz/muni/fi/pv168/project/ui/dialog/AbstractEntityDialog.java

 package cz.muni.fi.pv168.project.ui.dialog;
 
 import cz.muni.fi.pv168.project.ui.centering.WindowCenterer;
+import cz.muni.fi.pv168.project.ui.i18n.I18N;
 import cz.muni.fi.pv168.project.ui.resources.Icons;
 
 import javax.swing.BorderFactory;
@@ -23,6 +24,8 @@ abstract class AbstractEntityDialog<E> extends JDialog {
     private final JPanel panel;
     private final JButton okButton;
 
+    private static final I18N I18N = new I18N(AbstractEntityDialog.class);
+
     private boolean wasOk;
 
     AbstractEntityDialog() {
@@ -30,12 +33,12 @@ abstract class AbstractEntityDialog<E> extends JDialog {
         panel.setLayout(new GridBagLayout());
 
         wasOk = false;
-        okButton = new JButton("OK");
+        okButton = new JButton(I18N.getString("buttonConfirm"));
         okButton.addActionListener(e -> {
             wasOk = true;
             this.dispose();
         });
-        JButton cancelButton = new JButton("Cancel");
+        JButton cancelButton = new JButton(I18N.getString("buttonDismiss"));
         cancelButton.addActionListener(e -> this.dispose());
 
         GridBagConstraints gbc = new GridBagConstraints();
@@ -54,7 +57,7 @@ abstract class AbstractEntityDialog<E> extends JDialog {
         gbc.gridx = 2;
         okCancelPanel.add(cancelButton, gbc);
 
-        this.setTitle("New filesystem VM");
+        this.setTitle(I18N.getString("vmTitle"));
         this.setMinimumSize(new Dimension(300, 100));
         this.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
         this.setModalityType(ModalityType.APPLICATION_MODAL);

src/main/java/cz/muni/fi/pv168/project/ui/dialog/CategoryDialog.java

@@ -3,6 +3,7 @@ package cz.muni.fi.pv168.project.ui.dialog;
 import cz.muni.fi.pv168.project.color.AppColors;
 import cz.muni.fi.pv168.project.data.category.Category;
 import cz.muni.fi.pv168.project.ui.component.SimpleColorChooser;
+import cz.muni.fi.pv168.project.ui.i18n.I18N;
 
 import javax.swing.JLabel;
 import javax.swing.JTextField;
@@ -16,6 +17,8 @@ public class CategoryDialog extends AbstractLaidOutDialog<Category> {
     private final SimpleColorChooser colorField = new SimpleColorChooser();
     private final JLabel colorCodeField = new JLabel();
 
+    private static final I18N I18N = new I18N(CategoryDialog.class);
+
     public CategoryDialog() {
         colorCodeField.setText("#FFFFFF");
         colorField.getSelectionModel().addChangeListener(
@@ -34,8 +37,8 @@ public class CategoryDialog extends AbstractLaidOutDialog<Category> {
     }
 
     private void addFields() {
-        addLabeledField("Name:", nameField, labelGbc, componentGbc, getRowThenIncrement());
-        addLabeledField("Color:", colorField, labelGbc, componentGbc, getRowThenIncrement());
+        addLabeledField(I18N.getString("fieldLabelName"), nameField, labelGbc, componentGbc, getRowThenIncrement());
+        addLabeledField(I18N.getString("fieldLabelColor"), colorField, labelGbc, componentGbc, getRowThenIncrement());
 
         var colorCodeGbc = (GridBagConstraints) labelGbc.clone();
         colorCodeGbc.fill = GridBagConstraints.CENTER;

src/main/java/cz/muni/fi/pv168/project/ui/dialog/ComboBoxDialog.java

 package cz.muni.fi.pv168.project.ui.dialog;
 
 import cz.muni.fi.pv168.project.model.ComboBoxModelAdapter;
+import cz.muni.fi.pv168.project.ui.i18n.I18N;
 
 import javax.swing.JComboBox;
 import java.util.Collection;
@@ -8,10 +9,11 @@ import java.util.Collection;
 public class ComboBoxDialog<T> extends AbstractLaidOutDialog<T> {
 
     private final JComboBox<T> comboBox;
+    private static final I18N I18N = new I18N(ComboBoxDialog.class);
 
     public ComboBoxDialog(Collection<T> entities) {
         comboBox = new JComboBox<>(ComboBoxModelAdapter.fromCollection(entities));
-        addLabeledField("Select :", comboBox, labelGbc, middleComponent, getRow());
+        addLabeledField(I18N.getString("fieldLabelSelect"), comboBox, labelGbc, middleComponent, getRow());
 
         // gray out button when nothing is initially selected
         getOkButton().setEnabled(false);

src/main/java/cz/muni/fi/pv168/project/ui/dialog/SubTaskDialog.java

 package cz.muni.fi.pv168.project.ui.dialog;
 
 import cz.muni.fi.pv168.project.data.task.SubTask;
+import cz.muni.fi.pv168.project.ui.i18n.I18N;
 
 import javax.swing.JTextField;
 
@@ -9,6 +10,8 @@ public class SubTaskDialog extends AbstractLaidOutDialog<SubTask> {
     protected SubTask entity;
     protected final JTextField titleField = new JTextField();
 
+    private static final I18N I18N = new I18N(SubTaskDialog.class);
+
     public SubTaskDialog() {
         entity = new SubTask("");
         this.addTitle();
@@ -23,7 +26,7 @@ public class SubTaskDialog extends AbstractLaidOutDialog<SubTask> {
     }
 
     protected void addTitle() {
-        addLabeledField("Title:", titleField, labelGbc, componentGbc, getRowThenIncrement());
+        addLabeledField(I18N.getString("fieldLabelTitle"), titleField, labelGbc, componentGbc, getRowThenIncrement());
     }
 
     @Override

src/main/java/cz/muni/fi/pv168/project/ui/dialog/TaskDialog.java

@@ -2,6 +2,7 @@ package cz.muni.fi.pv168.project.ui.dialog;
 
 import cz.muni.fi.pv168.project.data.task.Task;
 import cz.muni.fi.pv168.project.model.LocalDateModel;
+import cz.muni.fi.pv168.project.ui.i18n.I18N;
 import org.jdatepicker.DateModel;
 import org.jdatepicker.JDatePicker;
 import org.joda.time.Duration;
@@ -31,6 +32,8 @@ public class TaskDialog extends AbstractLaidOutDialog<Task> {
     private final JTextField estimatedTimeField = new IntegerTextField(0);
     private final JDatePicker datePicker = new JDatePicker(dueTimeModel);
 
+    private static final I18N I18N = new I18N(TaskDialog.class);
+
     public TaskDialog() {
         descriptionField.setLineWrap(true);
         descriptionField.setFont(descriptionField.getFont().deriveFont(11f));
@@ -45,17 +48,17 @@ public class TaskDialog extends AbstractLaidOutDialog<Task> {
     }
 
     protected void addFields() {
-        addLabeledField("Title:", titleField, labelGbc, componentGbc, getRowThenIncrement());
-        addLabeledField("Description:", new JScrollPane(descriptionField), labelGbc, componentGbc, getRowThenIncrement());
-        addLabeledField("Estimated time:", createEstimatedTimePanel(), labelGbc, componentGbc, getRowThenIncrement());
-        addLabeledField("Due time:", datePicker, labelGbc, componentGbc, getRowThenIncrement());
+        addLabeledField(I18N.getString("labelTitle"), titleField, labelGbc, componentGbc, getRowThenIncrement());
+        addLabeledField(I18N.getString("labelDescription"), new JScrollPane(descriptionField), labelGbc, componentGbc, getRowThenIncrement());
+        addLabeledField(I18N.getString("labelEstTime"), createEstimatedTimePanel(), labelGbc, componentGbc, getRowThenIncrement());
+        addLabeledField(I18N.getString("labelDueTime"), datePicker, labelGbc, componentGbc, getRowThenIncrement());
     }
 
     private JPanel createEstimatedTimePanel() {
         JPanel estimatePanel = new JPanel(new BorderLayout());
 
         estimatePanel.add(estimatedTimeField, BorderLayout.CENTER);
-        estimatePanel.add(new JLabel(" hours"), BorderLayout.EAST);
+        estimatePanel.add(new JLabel(" " + I18N.getString("estimatedTimeUnit")), BorderLayout.EAST);
 
         return estimatePanel;
     }

src/main/java/cz/muni/fi/pv168/project/ui/dialog/error/ErrorDialog.java

 package cz.muni.fi.pv168.project.ui.dialog.error;
 
+import cz.muni.fi.pv168.project.ui.i18n.I18N;
 import javax.swing.JLabel;
 import javax.swing.JOptionPane;
 import javax.swing.JPanel;
@@ -15,6 +16,7 @@ import java.io.StringWriter;
 public final class ErrorDialog {
 
     private final JPanel panel = new JPanel();
+    private static final I18N I18N = new I18N(ErrorDialog.class);
 
     private ErrorDialog(String message, Throwable throwable) {
         panel.setLayout(new GridBagLayout());
@@ -39,7 +41,7 @@ public final class ErrorDialog {
     private void show(Component parentComponent) {
         JOptionPane.showMessageDialog(parentComponent,
                 panel,
-                "Error occurred",
+                I18N.getString("error"),
                 JOptionPane.ERROR_MESSAGE);
     }
 

src/main/java/cz/muni/fi/pv168/project/ui/main/panel/WelcomePanel.java

 package cz.muni.fi.pv168.project.ui.main.panel;
 
+import cz.muni.fi.pv168.project.ui.i18n.I18N;
+
 import javax.swing.BorderFactory;
 import javax.swing.JPanel;
 import javax.swing.JTextArea;
@@ -13,11 +15,9 @@ import java.awt.Font;
 public class WelcomePanel {
 
     private final JPanel panel;
-    private static final String WELCOME_MESSAGE =
-            "Welcome to to:do, your daily task reminder.\n" + "\n" +
-            "You can use the toolbar buttons above to add, edit, or delete tasks and categories.\n" +
-            "Switch between tasks and categories using the tabs.\n" +
-            "Click on a task in the list on the left to see details.";
+
+    private static final I18N I18N = new I18N(WelcomePanel.class);
+    private static final String WELCOME_MESSAGE = I18N.getString("welcomeMessage");
 
     public WelcomePanel() {
         var welcomeTextArea = new JTextArea(WELCOME_MESSAGE);

src/main/java/cz/muni/fi/pv168/project/ui/main/panel/listholder/CategoryHolderPanel.java

@@ -9,6 +9,7 @@ import cz.muni.fi.pv168.project.ui.action.DeleteAction;
 import cz.muni.fi.pv168.project.ui.action.EditAction;
 import cz.muni.fi.pv168.project.ui.dialog.factory.DialogFactory;
 import cz.muni.fi.pv168.project.ui.dialog.factory.ExistingCategoryDialogFactory;
+import cz.muni.fi.pv168.project.ui.i18n.I18N;
 import cz.muni.fi.pv168.project.ui.popup.PopupMenuFactory;
 import cz.muni.fi.pv168.project.ui.renderer.list.InnerColoredListRenderer;
 import cz.muni.fi.pv168.project.ui.resources.Icons;
@@ -20,17 +21,19 @@ public class CategoryHolderPanel extends AbstractHolderPanel<Category> {
 
     private final ExistingCategoryDialogFactory factory;
 
+    private static final I18N I18N = new I18N(CategoryHolderPanel.class);
+
     public CategoryHolderPanel(TaskCategoryDao categoryDao, CategoryDao parentDao) {
         super(
-                new TaskCategoryModel(categoryDao, parentDao), "Categories",
+                new TaskCategoryModel(categoryDao, parentDao), I18N.getString("panelName"),
                 new InnerColoredListRenderer<>(Category::getName, Category::getColor, Font.BOLD | Font.ITALIC),
                 Optional.empty());
 
         factory = new ExistingCategoryDialogFactory(parentDao);
         PopupMenuFactory.builder()
-                .addMenuItem(new AddAction<>(this, Icons.ADD_CATEGORY_ICON, "Add category").addUpdatable(this))
-                .addMenuItem(new EditAction<>(this, Icons.EDIT_CATEGORY_ICON, "Edit category").addUpdatable(this))
-                .addMenuItem(new DeleteAction<>(this, Icons.REMOVE_CATEGORY_BIN_ICON, "Remove category").addUpdatable(this))
+                .addMenuItem(new AddAction<>(this, Icons.ADD_CATEGORY_ICON, I18N.getString("addCategoryOption")).addUpdatable(this))
+                .addMenuItem(new EditAction<>(this, Icons.EDIT_CATEGORY_ICON, I18N.getString("editCategoryOption")).addUpdatable(this))
+                .addMenuItem(new DeleteAction<>(this, Icons.REMOVE_CATEGORY_BIN_ICON, I18N.getString("removeCategoryOption")).addUpdatable(this))
                 .buildFor(this.getList());
     }
 

src/main/java/cz/muni/fi/pv168/project/ui/main/panel/listholder/DependencyHolderPanel.java

@@ -9,6 +9,7 @@ import cz.muni.fi.pv168.project.ui.action.DeleteAction;
 import cz.muni.fi.pv168.project.ui.action.task.GoToAction;
 import cz.muni.fi.pv168.project.ui.dialog.factory.DependencyTaskDialogFactory;
 import cz.muni.fi.pv168.project.ui.dialog.factory.DialogFactory;
+import cz.muni.fi.pv168.project.ui.i18n.I18N;
 import cz.muni.fi.pv168.project.ui.popup.PopupMenuFactory;
 import cz.muni.fi.pv168.project.ui.renderer.list.TaskStatusListRenderer;
 import cz.muni.fi.pv168.project.ui.resources.Icons;
@@ -21,19 +22,21 @@ public class DependencyHolderPanel extends AbstractHolderPanel<Task> {
 
     private final DependencyTaskDialogFactory factory;
 
+    private static final I18N I18N = new I18N(DependencyHolderPanel.class);
+
     public DependencyHolderPanel(JList<Task> superiorTaskList, DependencyDao dependencyDao, TaskDao taskDao) {
         super(
-                new TaskDependencyModel(dependencyDao), "Dependencies",
+                new TaskDependencyModel(dependencyDao), I18N.getString("panelName"),
                 new TaskStatusListRenderer<>(Task::getTitle, Task::getTaskStatus, Task::isUrgent, Font.PLAIN),
                 Optional.of(Task::isCompleted)
         );
 
         factory = new DependencyTaskDialogFactory(dependencyDao, taskDao);
         PopupMenuFactory.builder()
-                .addMenuItem(new GoToAction(this, superiorTaskList, "Go to dependency"))
+                .addMenuItem(new GoToAction(this, superiorTaskList, I18N.getString("goToAction")))
                 .addSeparator()
-                .addMenuItem(new AddAction<>(this, Icons.ADD_TASK_ICON, "Add dependency").addUpdatable(this))
-                .addMenuItem(new DeleteAction<>(this, Icons.REMOVE_TASK_BIN_ICON, "Remove dependency").addUpdatable(this))
+                .addMenuItem(new AddAction<>(this, Icons.ADD_TASK_ICON, I18N.getString("addAction")).addUpdatable(this))
+                .addMenuItem(new DeleteAction<>(this, Icons.REMOVE_TASK_BIN_ICON, I18N.getString("removeAction")).addUpdatable(this))
                 .buildFor(this.getList());
     }