Browsertests: fix several broken tests in old-style browsertest

Change-Id: Ib3c27df4d2e7bf7fcd381e89864097e9279859f0
Cleanup wikibase-listdatatypes-* i18n keys

Bug: 61496
Change-Id: I895d50983f1a8b80cf48b24aa107608ff06089d7
Merge "Browsertests: fix several broken tests in old-style browsertest"