Always assign locale in detect_locale() (#1163)

* Always assign locale in detect_locale()

* Bump version of Debian used in CI builds from from buster to bullseye

* Update code comment

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Co-authored-by: nucleogenic <nr@nucleogenic.com>

docker/docker-compose.ci.yml

@@ -16,7 +16,7 @@ services:
       context: ..
       dockerfile: docker/web/Dockerfile
       args:
-        - OS_VERSION=buster
+        - OS_VERSION=bullseye
     volumes:
       - ./volumes/images:/home/pi/images:delegated
     init: true

python/web/src/web.py

@@ -1373,12 +1373,13 @@ def healthcheck():
 def detect_locale():
     """
     Get the detected locale to use for UI string translations.
-    This requires the Flask app to have started first.
+    Assign the language string to objects to be used for requests.
     """
     if "language" not in session.keys():
         session["language"] = get_locale()
-        piscsi_cmd.locale = session["language"]
-        file_cmd.locale = session["language"]
+
+    piscsi_cmd.locale = session["language"]
+    file_cmd.locale = session["language"]
 
 
 @APP.before_request