diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 2350d840..78526768 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -8,6 +8,14 @@ repos:
       require_serial: true
     - id: flutter-analyze
       require_serial: true
+- repo: local
+  hooks:
+    - id: arb-reformatter
+      name: reformat-strings
+      files: \.arb$
+      language: script
+      entry: arb_reformatter.py
+      require_serial: true
 
 # Python
 - repo: local
@@ -22,12 +30,10 @@ repos:
   rev: 6.1.0
   hooks:
     - id: flake8
-      files: helper/
 - repo: https://github.com/psf/black
   rev: 23.11.0
   hooks:
     - id: black
-      files: helper/
 - repo: https://github.com/PyCQA/bandit
   rev: 1.7.5
   hooks:
diff --git a/arb_reformatter.py b/arb_reformatter.py
index 0680edab..d3cf4ca0 100755
--- a/arb_reformatter.py
+++ b/arb_reformatter.py
@@ -5,24 +5,33 @@ import os
 
 
 def read_file_lines(file_path):
-    with open(file_path, 'r', encoding='utf-8') as file:
+    with open(file_path, "r", encoding="utf-8") as file:
         return file.readlines()
 
 
 def read_file_json(file_path):
-    with open(file_path, 'r', encoding='utf-8') as file:
+    with open(file_path, "r", encoding="utf-8") as file:
         return json.load(file)
 
 
 def write_to_file(file_path, text):
-    with open(file_path, 'w', encoding='utf-8') as file:
+    with open(file_path, "r", encoding="utf-8") as file:
+        if file.read() == text:
+            return False
+
+    with open(file_path, "w", encoding="utf-8") as file:
         file.write(text)
+    return True
+
 
 # Translation table for unicode characters we want to keep in escaped form.
-trans = str.maketrans({
-    '\u00a0': r"\u00a0", # No-Break Space (NBSP)
-    '\u2026': r"\u2026"  # Horizontal Ellipsis
-})
+trans = str.maketrans(
+    {
+        "\u00a0": r"\u00a0",  # No-Break Space (NBSP)
+        "\u2026": r"\u2026",  # Horizontal Ellipsis
+    }
+)
+
 
 # Move keys in target into same order as in source.
 # Keys not present in source are removed from target.
@@ -68,16 +77,16 @@ def update_arb_file(source_path, target_path, language_code):
         if line.strip() == "":
             target_lines.insert(i, "")
 
-    write_to_file(target_path, "\n".join(target_lines).strip() + "\n")
+    return write_to_file(target_path, "\n".join(target_lines).strip() + "\n")
 
 
 if __name__ == "__main__":
-    source_file_path = 'lib/l10n/app_en.arb'
-    target_directory = 'lib/l10n'
+    source_file_path = "lib/l10n/app_en.arb"
+    target_directory = "lib/l10n"
 
     for file_name in os.listdir(target_directory):
-        if file_name.startswith('app_') and file_name.endswith('.arb'):
+        if file_name.startswith("app_") and file_name.endswith(".arb"):
             target_file_path = os.path.join(target_directory, file_name)
-            language_code = file_name.split('_')[1].split('.')[0]
-            update_arb_file(source_file_path, target_file_path, language_code)
-            print(f'File updated: {file_name}')
+            language_code = file_name.split("_")[1].split(".")[0]
+            if update_arb_file(source_file_path, target_file_path, language_code):
+                print(f"File updated: {file_name}")
diff --git a/check_strings.py b/check_strings.py
index 535f1837..cd7fc4f1 100755
--- a/check_strings.py
+++ b/check_strings.py
@@ -106,7 +106,7 @@ if len(sys.argv) != 2:
 
 
 target = sys.argv[1]
-with open(target, encoding='utf-8') as f:
+with open(target, encoding="utf-8") as f:
     values = json.load(f, object_pairs_hook=check_duplicate_keys)
 
 strings = {k: v for k, v in values.items() if not k.startswith("@")}
@@ -115,7 +115,7 @@ print(target, f"- checking {len(strings)} strings")
 lint_strings(strings, values.get("@_lint_rules", {}))
 check_duplicate_values(strings)
 
-with open(os.path.join(os.path.dirname(target), 'app_en.arb'), encoding='utf-8') as f:
+with open(os.path.join(os.path.dirname(target), "app_en.arb"), encoding="utf-8") as f:
     reference_values = json.load(f)
 errors.extend(check_keys_exist_in_reference(reference_values, values))
 
diff --git a/lib/l10n/app_de.arb b/lib/l10n/app_de.arb
index 5d1dac5b..486d1ed0 100644
--- a/lib/l10n/app_de.arb
+++ b/lib/l10n/app_de.arb
@@ -136,6 +136,7 @@
 
     "@_app_configuration": {},
     "s_toggle_applications": "Anwendungen umschalten",
+    "s_toggle_interfaces": null,
     "l_min_one_interface": "Mindestens ein Interface muss aktiviert sein",
     "s_reconfiguring_yk": "YubiKey wird neu konfiguriert\u2026",
     "s_config_updated": "Konfiguration aktualisiert",
diff --git a/lib/l10n/app_fr.arb b/lib/l10n/app_fr.arb
index bba609c0..fbe734e3 100644
--- a/lib/l10n/app_fr.arb
+++ b/lib/l10n/app_fr.arb
@@ -136,6 +136,7 @@
 
     "@_app_configuration": {},
     "s_toggle_applications": "Changer les applications",
+    "s_toggle_interfaces": null,
     "l_min_one_interface": "Au moins une interface doit être activée",
     "s_reconfiguring_yk": "Reconfiguration de la YubiKey\u2026",
     "s_config_updated": "Configuration mise à jour",
diff --git a/lib/l10n/app_ja.arb b/lib/l10n/app_ja.arb
index 03079ff3..9feef971 100644
--- a/lib/l10n/app_ja.arb
+++ b/lib/l10n/app_ja.arb
@@ -136,6 +136,7 @@
 
     "@_app_configuration": {},
     "s_toggle_applications": "アプリケーションの切替え",
+    "s_toggle_interfaces": null,
     "l_min_one_interface": "少なくとも 1 つのインターフェイスを有効にする必要があります",
     "s_reconfiguring_yk": "YubiKeyを再構成しています\u2026",
     "s_config_updated": "構成が更新されました",