Slc.xliff

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- Nothing changed yet.

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- Test only Plone 5.2 and 6.0
[erral]

- Setup github actions
[erral]

- Allow language variants (pt-br) when importing files
[erral]

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- No changes.
[erral]

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- Changes to support python3 and Plone 5.2
[erral]

- Convert doctests to standard tests
[erral]

- Remove Archetypes support
[erral]

- Remove slc.shoppinglist support
[erral]

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- Bugfix in _guessLanguage

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This release drops support for LinguaPlone
and switches to plone.app.multilingual.

Todo:

- get rid of all references to slc.shoppinglist