I would like to contribute as well, as the Czech translation is pretty poor in some areas.
I have joined the Transifex, requested to join the OS project few days back, but not yet allowed to contribute.
Just tried another tool in the transifex and joining the translation is needed. Somewhere seems to be automatic, another might be upon an approval.
For OS I am not yet allowed…
May I ask what is a process of implementation of translations into the app?
Is there any approval in the tool needed?
Is the app taking approved once on regular basis? (frequency?)