This function will throw exceptions if the required parameters do not
exsit hence a stronger word is more appropriate here.
Also change the function parameter type to QVector. We don't need the
duplicate entries checking as currently we only use 3 fields at max and
can be easily checked by hand. So drop back to QVector which can be
constructed more efficiently.
QSet::contains(QSet &) isn't doing anything magical it still has the usual loop
inside, so lets just save all the container conversions and do the loop ourselves.
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.
