Mapper since ... for Turkish language

Hello,

There is a minor error in the spelling of the dates (unnecessary use of commas). Where can this part be corrected on Translatewiki?

That’s actually from the rails internationalisation data, and is not anything from our repository. I believe it’s https://github.com/svenfuchs/rails-i18n/blob/master/rails/locale/tr.yml#L43 which is responsible.