i18n: change Tool Labs link

- translate-group-desc-tsint

Spotted by Liuxinyu970226
https://translatewiki.net/wiki/Thread:Support/About_MediaWiki:Translate-group-desc-tsint/en

Change-Id: If4b400bf919d8fa663bac4f4d5b52ef52dc39cd0
Merge "i18n: change Tool Labs link"