Made `\thesis@english@thanksTitle` plural in locale files of MU, Brno.

example/mu/example.dtx

fithesis.dtx

guide/mu/guide.dtx

locale/english.dtx

style/mu/base.dtx

style/mu/sci.dtx

test/mu/compare-example/expected-econ-lualatex.pdf

test/mu/compare-example/expected-econ-pdflatex.pdf

test/mu/compare-example/expected-fi-lualatex.pdf

test/mu/compare-example/expected-fi-pdflatex.pdf

test/mu/compare-example/expected-fss-lualatex.pdf

test/mu/compare-example/expected-fss-pdflatex.pdf

test/mu/compare-example/expected-law-lualatex.pdf

test/mu/compare-example/expected-law-pdflatex.pdf

test/mu/compare-example/expected-med-lualatex.pdf

test/mu/compare-example/expected-med-pdflatex.pdf

test/mu/compare-example/expected-ped-lualatex.pdf

test/mu/compare-example/expected-ped-pdflatex.pdf

test/mu/compare-example/expected-phil-lualatex.pdf

test/mu/compare-example/expected-phil-pdflatex.pdf