Styler modifications

* Change base url of the writter to use app.proxy
* Added a new button to save default style
* Translation of last modification
Styler changes.

* Added GeoServerStyleWriter moded to handle layer name differences.
* New method in PersistenceGeo Context to confirm if an user is layers' owner
* Translation fixes
* Repair /ows/ url in styler request
* Proxy all styler request

Task #75731.
Added app.proxy to check if a style is available. #75731
Merge pull request #96 from alediator/75731_style_modifications

75731 style modifications