Refactor Toadlet registration for readability.

This moves repeated calls into methods and removes named instance
variables where there are not needed.
Fix localization key prefix.

The T in "WoT" is not capitalized in this case.
Fix WoT home page matching all requests.
Merge branch 'session-login' of https://github.com/Thynix/plugin-WoT-staging into Thynix-session-login