Deleted all ContentTranslation, TwnMainPage and Translate browsertests jobs

The jobs are failing. Deleting them until the language team has the
time to fix them.

Deleted jobs:

browsertests-ContentTranslation-language-stage.wmflabs.org-linux-firefox
-sauce
browsertests-Translate-meta.wikimedia.org-linux-firefox-sauce
browsertests-Translate-sandbox.translatewiki.net-linux-firefox-sauce
browsertests-TwnMainPage-sandbox.translatewiki.net-linux-firefox-sauce

Change-Id: I0202db8552c07bacc2b20ea913c7c02c1afda046
Paired-With: Amir Aharoni