The 'als' is used in a non-standard way in MediaWiki - it may be used to represent the Allemanic language, the standard code of which is 'gsw', while 'als' is ISO 639 3 refers to Tosk Albanian, which is not currently used in any way in MediaWiki. This local fix adds a redirect for it. Also add a test to check that it works correctly. Change-Id: Id904cab129eb58f8b96ce493e77d21da7c44ea8b