Aldryn-locations

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* Add formatting setting for marker info windows `ALDRYN_LOCATIONS_MARKER_CONTENT_FORMAT`

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* Use Environment variable for API key (when used with aldryn-addons)

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* Added translations infrastructure

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* Add stripped default django templates to `/aldryn_locations/templates`
* Fixed an issue with modal.open
* Removed deprecated sensor attribute

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* Aldryn addon settings update

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* multi-boilerplate support
new requirement: aldryn-boilerplates (needs configuration)