Update i18n/ with completed .po catalogues from translations repo.
Remove old .po catalogues whose replacements are still incomplete.
Remove compiled components of the .po files removed in the last commit.

The strings have changed so much due to the new web interface design that it
is useless to keep the old versions around because they only map to ~20% of
the strings. Not entirely sure how this is done, but I thought it made the
most sense to only include translations which are 100% complete.
Add compiled translation files. Currently supported languages are:

 * [ar] العربية
 * [da] dansk
 * [de] Deutsch
 * [el] ελληνικά
 * [en] English
 * [es] español
 * [eu] euskera
 * [fa] فارسی
 * [fr] français
 * [gl] galego
 * [he] עברית
 * [hr_HR] hrvatski jezik
 * [it] italiano
 * [ja] 日本語
 * [lv] latviešu valoda
 * [ms_MY] بهاس ملايو
 * [nb] Norsk bokmål
 * [nl] Nederlands
 * [pl] język polski
 * [pt_BR] português
 * [ru] русский язык
 * [si_LK] \u0dc3\u0dd2\u0d82\u0dc4\u0dbd
 * [sv] Svenska
 * [th] ไทย
 * [tr] Türkçe
 * [zh_CN] 中文

 ♥ ♥ ♥ to all our translators.
Merge branch 'fix/update-translations' into develop