Collective.themesitesetup

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- Fix issue where it was not possible to install message catalogs with dot in domain
[datakurre]

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- Pin zope.app.i18n < 4.0.0
[datakurre]

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- Removed debug print
[datakurre]

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- Patch TTW message catalogs to support plonejs18n view (translate-pattern),
but note that with plonejsi18n TTW catalog overrides don't cascade with
the existing catalogs
[datakurre]

- Use theme cache for TTW permissions, because TTW permissions require that
their existence is checked on each request
[datakurre]

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- Fix issue where message catalog support allowed (mostly accidentally)
overriding messages with empty strings. Messages with empty strings are
now ignored.
[datakurre]

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- Add to purge plone.app.blocks' site layout cache after resource directory
copy
[datakurre]