Normalize Web API method names.
Allow to use alternative Web UI.
Switch Web API version to standard form (i.e. "2.0").
Improve Web UI translation code.
Retranslate changed files.
Add Web API for RSS subsystem.
Don't reload HTML on tab change. Load the entire structure once and
keep the unused bits hidden.
Keep also the JS code separately, one file per tab.
NOTE: tabs content is not loaded. This will be fixed in the next commit.