gui: updated and renamed translation files, added belarusian from Mihas Varantsou * be_BY.ts, be_BY.qm: added belarusian translation from Mihas Vrantsou and updated to new strings in sources * xx-yy.ts,.qm: renamed into xx_YY.ts,.qm and updated to new strings in sources * generic.ts,.qm: updated to new strings in sources * transloators: added translator for belarusian translation * ressource-manager.cc(find-translator-file): change search path for testing the translation files

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