So I noticed a bug in the moodle language pack. I'm using the lt and lt_uni 3.4 language packs.
Literally everything is fine, except month selection translated text.
The month selection manu array is displayed as "sausis,vasaris,kovas,balandis,,birelis,liepa,rugpjtis,rugsjis,spalis,lapkritis,gruodis" (the the 5'th month is missing completely (May)).
The translation in the files is "Sausis,Vasaris,Kovas,Balandis,Gegužė,Birželis,Liepa,Rugpjūtis,Rugsėjis,Spalis,Lapkritis,Gruodis".
I suspected that moodle somehow cant parse LT symbols/alphabet or something. But thats weird because everywhere else the symbols are fine and displayed correctly. So I tried everything in my power to find and fix this issue:
1. Download/Update language packs
2. Completely delete language packs (and they did, didnt even show in the language menu)
3. Added brand new ones (3.4), and they appeared alright. (but the month selection was still in broken Lithuanian)
4. Cleared cache
5. Modified the files myself (moodledata\lang\lt_uni\editor_tinymce.php & moodledata\lang\lt_uni\attendance.php)
6. Edited the "moodledata\lang" files and the "moodle\lang" also.
7. Grep'ed the entire moodle and moodledata fodlers for the correct and broken strings (only found some arrays in the files listed above).
9. Restarted the server and cleared temp/cache dirs...
10. Nothing helps... the month string arrays is still broken....and I have no clue where it's getting the data from, because I tried to replace every month in that array with "test" of the language pack files and moodle didnt update the translation....so weird.
11. Modyfing in the Site administration -> Language -> Language customisation shows that the changes have been made and they are saved, even the "lt_local" files are created, but the month array still shows old broken strings :D