Article copy locale does not apply to routePath type page_tree_route

[Quehnie]

Q	A
Bug?	yes
New Feature?	no
SuluArticleBundle Version	2.5.1
Sulu Version	Specific version or SHA of a commit

Actual Behavior

Create an article which uses the page_tree_route type as routePath.
Then copy the article into another language, in the UI it will show the right page version of the new language,
but in the data the route path from the old site is copied. Which results into weird urls.

/de/neuigkeiten/firmenfest -> /en/neuigkeiten/company-party

Expected Behavior

Load the URL of the page with the target locale and add it into the data, if it does not exist remove the page from data and use /

Steps to Reproduce

See in Actual Behavior.

Possible Solutions

See in Expected Behavior