Working on routing

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Fix: #2595 - null error when creating new media object

Fix: #2226 - do not mirror CSS for select2 markup

Fix: drag'n'drop re-ordering

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Use class instead of inline styles

Fix: #2545 - PHP-Info pages are always left-aligned and ltr

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Fix: #2548 - unselecting a select2 control does not leave a default. Reverts part of 425f99bc29ab9e477e5407b5c86da5c85ba47461

Fix: select2 texts untranslated

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