Plone.app.locales

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- Update Italian translations
[ale-rt, arsenico13, cekk, pnicolli]

- Complete Spanish translation for widgets.po
[erral]

- Basque translations for widgets.po
[erral]

- Fix typos in French translations.
[laulaz]

- Fixed possible package install error with Python 3.6 when no system locale is set.
See `coredev issue 642 <https://github.com/plone/buildout.coredev/issues/642#issuecomment-597008272>`_.
[maurits]

- German translations for widgets.po.
- Synchronize with latest mockup.
- Structure pattern: Change message from misleading "Cannot order items while querying" to "Drag and drop reordering is disabled while filters are applied.".
Fixes: https://github.com/collective/plone.app.locales/issues/173
[thet]

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- Megaupdate plone.po RU locale.
[Serge73]

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- Fix French translation.
[laulaz]

- Update Japanese translations.

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- Update Portuguese-BR translations.

- Update French translations.

- Update Slovenian translations, sync from POT files.
[balavec]

- Update German: Inhalte werden "Erstellt" nicht "Erzeugt".
[jensens]

- Minor fixes in Basque
[erral]

- Update Spanish translation.
[erral]

- Update basque translation
[erral]

- Update Slovenian translations.
[balavec]

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- Update German translations, add most missing.
[jensens]

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- Update French, Basque, Catalan translations.