Help fix the localisation/internationalisation of MediaWiki
Read the internationalisation hints (ideally, the whole Localisation page), keep the messages API manual at hand.
Pick 3 i18n tasks and/or MediaWiki open support requests (translatewiki.net threads). Comment on each bug report or thread to say that you're working on it; add Nemo to the Subscribers/CC list on Phabricator if missing.
Triage the request appropriately to identify the issue and the correct action to take. Submit patches to gerrit, or provide the translator with the information needed to translate the messages (by editing their /qqq subpages), or reject the request if the message shouldn't be changed.
Add reviewers to your patches in Gerrit: at least Nemo. All questions on each task will be asked and answered on the relevant bug, patch or thread.
Post here a link to a gerrit change, bug or thread for each of the 3 issues; the task will be accepted here when they are marked merged/closed.