l10n: Update translations from Weblate, except keep nb

This prepares for a new beta release.  It also syncs down into our
repo all the translations we have so far, which will allow us to
reset all the state in Weblate as part of trying to work around its
odd treatment of `nb` and `nb_NO`:
  https://chat.zulip.org/#narrow/channel/243-mobile-team/topic/weblate.20translations.20.28.23F276.29/near/2039839
  https://chat.zulip.org/#narrow/channel/243-mobile-team/topic/weblate.20translations.20.28.23F276.29/near/2034260

As part of that workaround, the commit provided by Weblate was
adjusted to keep around `app_nb.arb`:

    git checkout @~ assets/l10n/app_nb.arb

Then like last time in c9c5f3d, the commit was adjusted like so:

    tools/check l10n --fix
    git add lib/generated/l10n/
    git commit --amend

Author: gnprice

assets/l10n/app_ar.arb

@@ -1,3 +1 @@
-{
-
-}
+{}

assets/l10n/app_fr.arb

@@ -696,5 +696,85 @@
   "userRoleModerator": "Moderator",
   "@userRoleModerator": {
     "description": "Label for UserRole.moderator"
+  },
+  "actionSheetOptionMuteTopic": "Wycisz wątek",
+  "@actionSheetOptionMuteTopic": {
+    "description": "Label for muting a topic on action sheet."
+  },
+  "actionSheetOptionUnmuteTopic": "Wznów wątek",
+  "@actionSheetOptionUnmuteTopic": {
+    "description": "Label for unmuting a topic on action sheet."
+  },
+  "actionSheetOptionFollowTopic": "Śledź wątek",
+  "@actionSheetOptionFollowTopic": {
+    "description": "Label for following a topic on action sheet."
+  },
+  "actionSheetOptionUnfollowTopic": "Nie śledź wątku",
+  "@actionSheetOptionUnfollowTopic": {
+    "description": "Label for unfollowing a topic on action sheet."
+  },
+  "switchAccountButton": "Przełącz konto",
+  "@switchAccountButton": {
+    "description": "Label for main-menu button leading to the choose-account page."
+  },
+  "tryAnotherAccountMessage": "Twoje konto na {url} wymaga jeszcze chwili na załadowanie.",
+  "@tryAnotherAccountMessage": {
+    "description": "Message that appears on the loading screen after waiting for some time.",
+    "url": {
+      "type": "String",
+      "example": "http://chat.example.com/"
+    }
+  },
+  "tryAnotherAccountButton": "Sprawdź inne konto",
+  "@tryAnotherAccountButton": {
+    "description": "Label for loading screen button prompting user to try another account."
+  },
+  "errorFollowTopicFailed": "Śledzenie bez powodzenia",
+  "@errorFollowTopicFailed": {
+    "description": "Error message when following a topic failed."
+  },
+  "inboxPageTitle": "Odebrane",
+  "@inboxPageTitle": {
+    "description": "Title for the page with unreads."
+  },
+  "channelsPageTitle": "Kanały",
+  "@channelsPageTitle": {
+    "description": "Title for the page with a list of subscribed channels."
+  },
+  "emojiReactionsMore": "więcej",
+  "@emojiReactionsMore": {
+    "description": "Label for a button opening the emoji picker."
+  },
+  "emojiPickerSearchEmoji": "Szukaj emoji",
+  "@emojiPickerSearchEmoji": {
+    "description": "Hint text for the emoji picker search text field."
+  },
+  "dialogClose": "Zamknij",
+  "@dialogClose": {
+    "description": "Button label in dialogs to close."
+  },
+  "errorReactionRemovingFailedTitle": "Usuwanie reakcji bez powodzenia",
+  "@errorReactionRemovingFailedTitle": {
+    "description": "Error title when removing a message reaction fails"
+  },
+  "errorReactionAddingFailedTitle": "Dodanie reakcji bez powodzenia",
+  "@errorReactionAddingFailedTitle": {
+    "description": "Error title when adding a message reaction fails"
+  },
+  "errorMuteTopicFailed": "Wyciszenie bez powodzenia",
+  "@errorMuteTopicFailed": {
+    "description": "Error message when muting a topic failed."
+  },
+  "mainMenuMyProfile": "Mój profil",
+  "@mainMenuMyProfile": {
+    "description": "Label for main-menu button leading to the user's own profile."
+  },
+  "errorUnfollowTopicFailed": "Nie śledź bez powodzenia",
+  "@errorUnfollowTopicFailed": {
+    "description": "Error message when unfollowing a topic failed."
+  },
+  "errorUnmuteTopicFailed": "Wznowienie bez powodzenia",
+  "@errorUnmuteTopicFailed": {
+    "description": "Error message when unmuting a topic failed."
   }
 }