Use DataValue for consistency

Reported by Lokal Profil at
https://translatewiki.net/wiki/Thread:Support/About_MediaWiki:Apihelp-wbsetclaimvalue-param-value/sv

Change-Id: Ib9dfc0d1e2c54a00571644a81c1130a4bd757cd4
Fix grammar

Reported by Lokal Profil at
https://translatewiki.net/wiki/Thread:Support/About_MediaWiki:Apihelp-wbsetaliases-param-language/sv

Change-Id: I2d09054a90e8c5a41828783d97014bdf52d5a5c9