Localization update does not update configuration translations

This should fix it.

This is needed for our Lab. Tagging D8MIAMS.

Looks good, some minor comments:

1. +++ b/core/modules/locale/src/Tests/LocaleConfigTranslationImportTest.php
   @@ -0,0 +1,85 @@
   + * Tests translation of configuration strings.
   

   This is a bit too generic :) I would try to get the same 1 line text that is on the test method.

2. +++ b/core/modules/locale/src/Tests/LocaleConfigTranslationImportTest.php
   @@ -0,0 +1,85 @@
   +   * Tests configuration translation import when locale module is enabled after
   +   * a language was added.
   

   Would be great to get this on one line, eg. "Test localization update will change configuration translations if enabled after language." (did not check if this fits on one line in fact :D)

3. +++ b/core/modules/locale/src/Tests/LocaleConfigTranslationImportTest.php
   @@ -0,0 +1,85 @@
   +    // Add translation permissions now the locale module has been enabled.
   

   "now that the"

4. +++ b/core/modules/locale/src/Tests/LocaleConfigTranslationImportTest.php
   --- /dev/null
   +++ b/core/modules/locale/tests/test.af.po
   

   There is no code apparent in this patch that makes this file be the result of update checking, where is that located? I suspect preexisting in core.

@Sutharsan: this seemed like was so close, are you still around to fix this one?

The answer to #20/4 is this snippet from locale_translate_test which module is used in the test. The other minor text fixes I made myself. That should not disqualify me from RTBC-ing it since the changes are so minor.

'interface translation project': locale_test_translate
'interface translation server pattern': core/modules/locale/tests/test.%language.po

Minor PHP issue.

@alexpott: the problem with the update-test path/route is it would expect some arguments, namely project and version. Then it actually ignores version later on (haha). For this test, all we need is a URL that would not return much valid info, because we only work off of local stuff here (see locale_test_translate.info.yml), so this override is for the rest of the projects so they don't interfere with the test. To fix the update-test route that requires unrelated changes, so we can just use the front page here just as well.

Better?

Thanks a lot!

Also restoring original title.