Enable Fluent string replacement for Pocket About page

Note how we get the brands.ftl from main l10n to _always_ be used in Pocket
mode, regardless of locale.

bedrock/pocket/urls.py

@@ -5,7 +5,11 @@
 from bedrock.mozorg.util import page
 
 urlpatterns = (
-    page("about/", "pocket/about.html"),
+    page(
+        "about/",
+        "pocket/about.html",
+        ftl_files=["pocket/about"],
+    ),
     page("add/", "pocket/add.html"),
     page("android/", "pocket/android.html"),
     page("ios/", "pocket/ios.html"),

bedrock/settings/__init__.py

@@ -95,7 +95,10 @@
 
 site_mode = config("SITE_MODE", default=MOZORG_SITE_MODE)
 
-if site_mode == POCKET_SITE_MODE:
+IS_POCKET_MODE = site_mode == POCKET_SITE_MODE
+IS_MOZORG_MODE = not IS_POCKET_MODE
+
+if IS_POCKET_MODE:
     ROOT_URLCONF = "bedrock.urls.pocket_mode"
 
     # DROP the redirects app and middleware, because it's contains Mozorg-specific rules that
@@ -106,11 +109,15 @@
     # TODO: define in Pocket-appropriate versions of
     # DEV_LANGUAGES, PROD_LANGUAGES, CANONICAL_LOCALES,
     # FLUENT_* overrides for Pocket L10N, etc
+    FLUENT_DEFAULT_FILES = [
+        "nav",
+        "footer",
+    ]
+    FLUENT_POCKET_LOCAL_PATH = ROOT_PATH / "l10n-pocket"
+    FLUENT_PATHS.insert(0, FLUENT_POCKET_LOCAL_PATH)
+
 else:
     ROOT_URLCONF = "bedrock.urls.mozorg_mode"
-    # TODO: move Mozorg-appropriate versions of
-    # DEV_LANGUAGES, PROD_LANGUAGES, CANONICAL_LOCALES,
-    # FLUENT_* overrides for Pocket L10N into this file
 
 # TEST-SPECIFIC SETTINGS
 # TODO: make this selectable by an env var, like the other modes

bedrock/settings/base.py

@@ -239,8 +239,9 @@ def data_path(*args):
 
 GITHUB_REPO = "https://github.com/mozilla/bedrock"
 
-# Default l10n config is for mozorg. See settings/__init__.py for where we [will] plug in
-# an alternative Pocket-appropriate l10n setup.
+# IMPORTANT: The default l10n config here is for Mozorg. See settings/__init__.py
+# for where we plug in an alternative Pocket-appropriate l10n setup.
+
 # Global L10n files.
 FLUENT_DEFAULT_FILES = [
     "banners/firefox-app-store",

lib/l10n_utils/fluent.py

@@ -161,10 +161,9 @@ def load_fluent_resources(root, locale, resource_ids):
 
         resources.append(load_fluent_file(path))
     if resources:
-        if locale != "en":
+        if locale != "en" or settings.IS_POCKET_MODE:
             path = settings.FLUENT_LOCAL_PATH.joinpath("en", "brands.ftl")
             resources.append(load_fluent_file(path))
-
     return resources