Store language (#251)

* clean out unneeded locales
* add test to verify that language is picked up in admin.cfg
* add basic question for language and use variable in compose
* use scriptlet to generate locales before start of kopano-server
* add script to check folders of a given mailbox (for language checks)
* add tests for locale generation

relates to #248

scheduler/commander.yaml

@@ -0,0 +1,26 @@
+tests:
+  check mailbox language: # this needs a running kopano-server can can therefore not be executed in that container directly
+    command: "docker exec kopano_server kopano-storeadm -C -n user10; docker exec kopano_server show-folders.py --user user10"
+    exit-code: 0
+    stdout:
+      contains:
+        - "Inbox"
+        - "Drafts"
+  check mailbox language german: # this needs a running kopano-server can can therefore not be executed in that container directly
+    command: "docker exec kopano-storeadm -D user 11; docker exec kopano_server kopano-storeadm -C -l de_DE -n user11; docker exec kopano_server show-folders.py --user user11"
+    exit-code: 0
+    stdout:
+      not-contains:
+        - "Inbox"
+        - "Drafts"
+  test renaming of folders:
+    command: docker exec kopano_server env KCCONF_ADMIN_DEFAULT_STORE_LOCALE=de_DE.UTF-8 /usr/bin/python3 /kopano/server.py && docker exec kopano_server kopano-storeadm -Y -n user12
+    exit-code: 0
+    stderr:
+      contains:
+        - The -l option was not specified; "de_DE.UTF-8" will be used as language
+        - Posteingang
+        - Entwürfe
+config:
+  env:
+    PATH: ${PATH}