diff --git a/screen_manager/app/i18n.py b/screen_manager/app/i18n.py
index 521cb40..a8e2029 100644
--- a/screen_manager/app/i18n.py
+++ b/screen_manager/app/i18n.py
@@ -133,6 +133,25 @@ def t(key, **params):
     return TRANSLATIONS.text(key, REQUEST_LANGUAGE.get(), **params)
 
 
+# The screens' language and number format (Settings -> Language & region), for the words the app sends to the screens
+# itself: tile names, the top bar, the history card. The manager keeps it current (Manager.language_changed).
+SCREENS = {'language': 'en', 'numbers': 'point'}
+
+
+def set_screens(language, numbers):
+    SCREENS.update(language=language, numbers=numbers)
+
+
+def screen_t(key, **params):
+    """A text in the screens' language, for what the app sends to them."""
+    return TRANSLATIONS.text(key, SCREENS['language'], **params)
+
+
+def screen_number(text):
+    """A number as Home Assistant sends it, written as the screens write numbers ("1.234,5" in Dutch)."""
+    return format_number(text, SCREENS['numbers'])
+
+
 class Region:
     """Settings -> Language & region, kept in /data/language.json: one language, clock and number format for every
     screen. A screen's firmware carries its language; the clock and the numbers travel in the layout message."""
diff --git a/screen_manager/app/server.py b/screen_manager/app/server.py
index 8dea2dc..0fcb10d 100644
--- a/screen_manager/app/server.py
+++ b/screen_manager/app/server.py
@@ -571,6 +571,7 @@ class Manager:
         self.ha.language_of = self.region.language
         self.ha.on_config = self.language_changed
         self.pin_clock = False
+        i18n.set_screens(self.region.language(), self.region.number_style())
         self.skill_dir = claude_skill.skill_dir()
         self._registry_source, self._registry_index = None, {}
         self._items_source, self._items = None, []
@@ -1151,6 +1152,7 @@ class Manager:
             if known and all(state == 'off' for state in known):
                 self.region.clock = '12'
                 self.region.save()
+        i18n.set_screens(self.region.language(), self.region.number_style())
         self.ha.services_changed.set()
         self.sent.clear()
         self.write_languages()