The commit https://gerrit.wikimedia.org/r/#/c/233723/ overwrote the localization files - both the updates in English that were done in the last few months and the existing translations.
This created a lot of mess in translatewiki - a lot of fuzzy messages that shouldn't be fuzzy, etc.
I don't know about the functional changes that that commit does, but the localization changes are definitely wrong and must be reverted and cleaned up ASAP.
Thanks for understanding.