Site information is displayed in the wrong language on the site information translation page

Updated: Comment #1

Problem/Motivation

When you have translated the site information (site name, slogan) and go to edit that translation, the *actual* site name and slogan are displayed translated, even if the actual admin page that you're on is an English one. I.e. you are on example.com/admin/... not example.com/de/admin/..., for example.

I can think of two possible reasons for this:
A: The language negotation system checks for the "langcode" query parameter (the actual url is e.g. http://drupal-8.loc/admin/config/system/site-information/translate?action=edit&langcode=de). That should not happen, though.
B: During the creation of the translation form the language configuration context is entered at some point, but never left, so when the site name part of the site does its $config->get() the language context ist still active and thus returns the translated values.

Steps to reproduce

1. Install Configuration Translation module
2. Create at least one additional language (URL: admin/config/regional/language)
3. Go to the site information form (URL: admin/config/system/site-information)
4. Click on the Translate settings tab and add a translation in the newly added language
5. After saving the translation, go to edit it again

Proposed resolution

Remaining tasks

User interface changes

API changes

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