Fix translation keys filter (pimcore#934)

* Fix translation keys filter

* Apply php-cs-fixer changes

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Co-authored-by: fashxp <8792145+fashxp@users.noreply.github.com>

Fix translation keys filter (pimcore#934)

* Fix translation keys filter

* Apply php-cs-fixer changes

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Co-authored-by: fashxp <8792145+fashxp@users.noreply.github.com>

[Bug]: Cors headers not set when cache was not enabled (pimcore#925)

* Fix: Cors header where set only when cache enabled

* Apply php-cs-fixer changes

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Co-authored-by: mcop1 <mcop1@users.noreply.github.com>

Merge branch '1.8' into 1.x

Merge branch '1.8' into 1.x

[Task] Update docs (pimcore#920)

* Added new doc for alias operator

* Added new doc for alias operator

* Fix operators

* Removed isOperator variable

* Removed debug info

* Added new operator section and documentation

* Added new operator section and documentation

* More operators

* Added examples and screenshots

* Reverted change to merge operator

* Added mutation examples

* Update security settings

* Fix links

* Fix links

* Updated mutations page

* Updated mutations page

* Code format and lightboxes

* Added info boxes

* Updated documentation for advanced relations

* Removed unused screenshots

* Removed unused screenshots

Merge remote-tracking branch 'origin/1.7' into 1.8

Fix regression from pimcore#875 (pimcore#910)

* Fix regression from pimcore#875

* getValueForObject/getValueFromObjectBrick returns mixed

* setValue return mixed

Use constant for 'datahub_context' instead hardcoded value (pimcore#880)

* Use constant for  'datahub_context' instead hardcoded value

* Removed unused variable $context in DocumentTreeType.

* Removed unused imports.

Merge remote-tracking branch 'origin/1.7' into 1.8