Web browser: ---
            Bug ID: 61115
           Summary: Drop URL parameter setlang
           Product: MediaWiki extensions
           Version: master
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: UniversalLanguageSelector
        Depends on: 44649
    Classification: Unclassified
   Mobile Platform: ---

At the moment it is possible to change the user interface language with the URL
parameter setlang in a GET request. GET should be a safe method which should
not change the state of the server.[1]

Bug 49299 gets WONTFIXed by comment 1: "Given that the user will get a popup to
switch back easily, and that changing the language (afaict) is just an
annoyance for the user, I'm not convinced."[2]
A possibility to switch back does not make this behavior to a safe method.

I suggest to drop the URL parameter setlang completely and suggest two

1. Change the user interface language via API and open the page without
parameter in the desired language. Described in bug 44649 and implemented in for mw.uls.changeLanguage().
The language can still changed with a single click and the new page has no     
troublesome URL parameter.

2. On situations where no API call is possible use uselang instead of setlang
and implement a popup to easily keep this language instead of the popup to
switch back easily. The user has explicitly to confirm the change of the user
setting by a single click. This is important because the link can come from a
foreign page.

For a transition time the parameter setlang can have the same behavior as the
parameter uselang.


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