i18n: Rename 11 messages for case-compliance

i18n: Rename 11 messages for case-compliance

Can't yet enforce due to the API.

* allmessagesnotsupportedDB
* rcfilters-filtergroup-userExpLevel
* rcfilters-filtergroup-lastRevision
* number_of_watching_users_RCview
* apihelp-query+allfileusages-example-B
* apihelp-query+allimages-example-B
* apihelp-query+alllinks-example-B
* apihelp-query+allpages-example-B
* apihelp-query+allredirects-example-B
* apihelp-query+alltransclusions-example-B
* apihelp-query+allusers-example-Y
* apiwarn-wgDebugAPI

Change-Id: I95961dfeb43e9cfadc867a48866af6335022572a