Minor change to ‘binaries/data/mods/public/gui/pregame/mainmenu.js’ in order to make a strings easier to understand by translators.
New dependency: icu (required for date localization, must-have library for localization in general)
Initial C++-side Localization Support

• Renamed ‘po’ folders to ‘localization’, as they may include additional content in the future.
• Added support for date localization on the C++ side using ICU.
• Added support for string localization on the JavaScript side calling a C++-side function (so that PO files only need to be loaded on the C++ side).
• Added support for generating a POT file for engine localization, and downloading PO files from Transifex.
• Simplified the Localization system language detection a great deal using ICU.