I just submitted the new strings for Moodle Mobile 3.3.1
You can find the strings to be translated in the component: local_moodlemobileapp version 2.6 (you only need to translate the strings for that version, no need to copy the strings in following ones).
This new version will be released in a couple of days (really sorry for the short notice!).
BTW this version includes two new languages (three language packs): Lithuanian and Serbian (Cyrillic and Latin alphabets)
Thanks for your contributions!