generateId -> mw.user.generateRandomSessionId

As the existing comment block implies, generating random hashes for
tagging users and sessions is generic and useful enough to merit
exporting it out of closure scope. But 'user.generateId' would be
confusing, so I renamed it to 'generateRandomSessionId' instead.

Change-Id: I08f91a501c6883ab684b6864a93153b0e2dc34fc
Merge "generateId -> mw.user.generateRandomSessionId"
The right casing is IcuCollation

Follow-up to e8c0c2ad.

Change-Id: Ic2240a7e09abe607c87df64fd688b908fb8aa580
Merge "The right casing is IcuCollation"