calendar: Don't ever force reload

https://bugzilla.gnome.org/show_bug.cgi?id=720298
calendar: Don't rebuild the entire calendar widget when choosing a date

It's inefficient and wasteful. Combined with the JS GC not being great,
it leaks around 100 actors waiting to be GC'd. Yikes.

https://bugzilla.gnome.org/show_bug.cgi?id=720298
Remove use of superfluous MetaWindowActor APIs
Updated Galician translations
Tajik translation updated
Updated Spanish translation
Bump version to 3.11.3

Update NEWS.
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[l10n] Updated Italian translation.
ShellAppSystem: own the memory for the startup wm class and app id

The hash table must keep a copy of the IDs, because the GAppInfos
are unreferenced (and thus freed) at the end of the function.
This was possibly not a problem if the GAppInfos were referencing
the memory-mapped cache, but it becomes one for regularly parsed
desktop files in ~/.local.

https://bugzilla.gnome.org/show_bug.cgi?id=721039
Updated Brazilian Portuguese translation
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Updated Czech translation
Updated Spanish translation
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