i18n: Add files to POTFILES

Closes https://gitlab.gnome.org/GNOME/fractal/-/issues/752.

po/POTFILES.in

@@ -1,5 +1,56 @@
-data/resources/ui/shortcuts.ui
-data/resources/ui/window.ui.in
+# List of source files containing translatable strings.
+# Please keep this file sorted alphabetically.
 data/org.gnome.FractalNext.desktop.in.in
 data/org.gnome.FractalNext.gschema.xml.in
 data/org.gnome.FractalNext.metainfo.xml.in.in
+
+# UI files
+data/resources/ui/content-divider-row.ui
+data/resources/ui/content-item-row-menu.ui
+data/resources/ui/content-item.ui
+data/resources/ui/content-message-row.ui
+data/resources/ui/content-state-row.ui
+data/resources/ui/content.ui
+data/resources/ui/context-menu-bin.ui
+data/resources/ui/login.ui
+data/resources/ui/session.ui
+data/resources/ui/shortcuts.ui
+data/resources/ui/sidebar-category-row.ui
+data/resources/ui/sidebar-item.ui
+data/resources/ui/sidebar-room-row.ui
+data/resources/ui/sidebar.ui
+data/resources/ui/window.ui
+
+# Rust files
+src/application.rs
+src/components/context_menu_bin.rs
+src/components/mod.rs
+src/login.rs
+src/main.rs
+src/secret.rs
+src/session/categories/categories.rs
+src/session/categories/category.rs
+src/session/categories/category_type.rs
+src/session/categories/mod.rs
+src/session/content/content.rs
+src/session/content/divider_row.rs
+src/session/content/item_row.rs
+src/session/content/message_row.rs
+src/session/content/mod.rs
+src/session/content/state_row.rs
+src/session/mod.rs
+src/session/room/event.rs
+src/session/room/highlight_flags.rs
+src/session/room/item.rs
+src/session/room/mod.rs
+src/session/room/room.rs
+src/session/room/timeline.rs
+src/session/sidebar/category_row.rs
+src/session/sidebar/mod.rs
+src/session/sidebar/room_row.rs
+src/session/sidebar/row.rs
+src/session/sidebar/selection.rs
+src/session/sidebar/sidebar.rs
+src/session/user.rs
+src/utils.rs
+src/window.rs