Review Mozilla 1782579: Add a locale parameter to the text recognition API

Link: https://bugzilla.mozilla.org/show_bug.cgi?id=1782579

So adding local as a param in itself is probably fine since we don't try to obfuscate that. However, we need to look into the text recognition system as a whole. If it's uploading shit to a remote service we should nuke it, but if it's all local then we should be good here.