diff --git a/i18n.config.ts b/i18n.config.ts
index dc2edeb..2f343a0 100644
--- a/i18n.config.ts
+++ b/i18n.config.ts
@@ -1,4 +1,14 @@
+import locales from './maintenance/locales.json'
+
+// https://vue-i18n.intlify.dev/guide/essentials/fallback#explicit-fallback-with-decision-maps
+const fallbackLocale = Object.fromEntries(
+  locales
+    .filter((locale) => locale.fallback)
+    .map((locale) => [locale.code, locale.fallback]),
+) as Record<string, string[]>
+fallbackLocale.default = ['en']
+
 export default defineI18nConfig(() => ({
   legacy: false,
-  fallbackLocale: 'en',
+  fallbackLocale,
 }))
diff --git a/locales/br.json b/locales/br.json
index c4b33d5..3fa56fb 100644
--- a/locales/br.json
+++ b/locales/br.json
@@ -2,6 +2,7 @@
     "_language": {
         "code": "br",
         "dir": "ltr",
+        "fallback": "fr",
         "name": "Brezhoneg"
     }
 }
diff --git a/locales/en.json b/locales/en.json
index 8e4752f..a6c8dbc 100644
--- a/locales/en.json
+++ b/locales/en.json
@@ -2,6 +2,7 @@
     "_language": {
         "code": "en",
         "dir": "ltr",
+        "fallback": "en",
         "name": "English"
     },
     "add_forward": "Add an e-mail forwarding address",
diff --git a/maintenance/clean_locales.py b/maintenance/clean_locales.py
index 9d105db..861a65b 100644
--- a/maintenance/clean_locales.py
+++ b/maintenance/clean_locales.py
@@ -78,23 +78,30 @@ def remove_stale_translations(ref="en", locales=None):
 def generate_locales_list():
     locales = []
 
-    for locale in ALL_LOCALES:
+    for locale in sorted(ALL_LOCALES):
         path = LOCALE_FILES[locale]
         data = get_json(path).get("_language", {})
         code = data.get("code", locale)
+        fallback = [
+            code.strip() for code in data.get("fallback", "").strip().split(",")
+        ]
+        # Remove "en" from fallback locales since there's already a last resort fallback to "en"
+        fallback = [code for code in fallback if code not in ("en", "")]
+
         if locale != code:
             # Warn that translators have changed the language code
             print(
                 f"Language's code for file '{locale}.json' is '{code}': file"
                 " should probably be renamed to '{code}.json'"
             )
+
         locales.append(
             {
                 "code": code,
                 "iso": code,
                 "name": data.get("name", code),
                 "dir": data.get("dir", "ltr"),
-                "fallback": data.get("fallback", "en"),
+                "fallback": fallback or None,
                 "file": f"{locale}.json",
             }
         )
diff --git a/maintenance/locales.json b/maintenance/locales.json
index ba4e7ce..f15006f 100644
--- a/maintenance/locales.json
+++ b/maintenance/locales.json
@@ -1,330 +1,332 @@
 [
-    {
-        "code": "el",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "el.json",
-        "iso": "el",
-        "name": "Eλληνικά"
-    },
-    {
-        "code": "te",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "te.json",
-        "iso": "te",
-        "name": "Telugu"
-    },
-    {
-        "code": "ja",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "ja.json",
-        "iso": "ja",
-        "name": "日本語"
-    },
     {
         "code": "ar",
         "dir": "rtl",
-        "fallback": "en",
+        "fallback": null,
         "file": "ar.json",
         "iso": "ar",
         "name": "العربية"
     },
-    {
-        "code": "fi",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "fi.json",
-        "iso": "fi",
-        "name": "Suomi"
-    },
-    {
-        "code": "ne",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "ne.json",
-        "iso": "ne",
-        "name": "नेपाली"
-    },
-    {
-        "code": "de",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "de.json",
-        "iso": "de",
-        "name": "Deutsch"
-    },
-    {
-        "code": "es",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "es.json",
-        "iso": "es",
-        "name": "Español"
-    },
-    {
-        "code": "it",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "it.json",
-        "iso": "it",
-        "name": "Italiano"
-    },
-    {
-        "code": "pl",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "pl.json",
-        "iso": "pl",
-        "name": "Polski"
-    },
-    {
-        "code": "uk",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "uk.json",
-        "iso": "uk",
-        "name": "Українська"
-    },
-    {
-        "code": "eo",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "eo.json",
-        "iso": "eo",
-        "name": "Esperanto"
-    },
-    {
-        "code": "he",
-        "dir": "rtl",
-        "fallback": "en",
-        "file": "he.json",
-        "iso": "he",
-        "name": "עברית"
-    },
-    {
-        "code": "id",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "id.json",
-        "iso": "id",
-        "name": "Bahasa Indonesia"
-    },
-    {
-        "code": "ca",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "ca.json",
-        "iso": "ca",
-        "name": "Català"
-    },
-    {
-        "code": "en",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "en.json",
-        "iso": "en",
-        "name": "English"
-    },
-    {
-        "code": "lt",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "lt.json",
-        "iso": "lt",
-        "name": "Lietuvių"
-    },
-    {
-        "code": "kab",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "kab.json",
-        "iso": "kab",
-        "name": "Taqbaylit"
-    },
-    {
-        "code": "hu",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "hu.json",
-        "iso": "hu",
-        "name": "Magyar"
-    },
-    {
-        "code": "eu",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "eu.json",
-        "iso": "eu",
-        "name": "Euskara"
-    },
-    {
-        "code": "cs",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "cs.json",
-        "iso": "cs",
-        "name": "Čeština"
-    },
-    {
-        "code": "sv",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "sv.json",
-        "iso": "sv",
-        "name": "Svenska"
-    },
-    {
-        "code": "oc",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "oc.json",
-        "iso": "oc",
-        "name": "Occitan"
-    },
-    {
-        "code": "ru",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "ru.json",
-        "iso": "ru",
-        "name": "Русский"
-    },
-    {
-        "code": "sl",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "sl.json",
-        "iso": "sl",
-        "name": "Slovenščina"
-    },
-    {
-        "code": "br",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "br.json",
-        "iso": "br",
-        "name": "Brezhoneg"
-    },
-    {
-        "code": "nb-NO",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "nb_NO.json",
-        "iso": "nb-NO",
-        "name": "Norsk bokmål"
-    },
-    {
-        "code": "pt",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "pt.json",
-        "iso": "pt",
-        "name": "Português"
-    },
-    {
-        "code": "mk",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "mk.json",
-        "iso": "mk",
-        "name": "македонски"
-    },
-    {
-        "code": "fr",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "fr.json",
-        "iso": "fr",
-        "name": "Français"
-    },
-    {
-        "code": "nl",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "nl.json",
-        "iso": "nl",
-        "name": "Nederlands"
-    },
-    {
-        "code": "fa",
-        "dir": "rtl",
-        "fallback": "en",
-        "file": "fa.json",
-        "iso": "fa",
-        "name": "فارسی"
-    },
-    {
-        "code": "hi",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "hi.json",
-        "iso": "hi",
-        "name": "हिन्दी"
-    },
-    {
-        "code": "tr",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "tr.json",
-        "iso": "tr",
-        "name": "Türkçe"
-    },
-    {
-        "code": "pt-BR",
-        "dir": "ltr",
-        "fallback": "en",
-        "file": "pt_BR.json",
-        "iso": "pt-BR",
-        "name": "Português brasileiro"
-    },
     {
         "code": "bn-BD",
         "dir": "ltr",
-        "fallback": "en",
+        "fallback": null,
         "file": "bn_BD.json",
         "iso": "bn-BD",
         "name": "বাংলা"
     },
+    {
+        "code": "br",
+        "dir": "ltr",
+        "fallback": [
+            "fr"
+        ],
+        "file": "br.json",
+        "iso": "br",
+        "name": "Brezhoneg"
+    },
+    {
+        "code": "ca",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "ca.json",
+        "iso": "ca",
+        "name": "Català"
+    },
     {
         "code": "ckb",
         "dir": "rtl",
-        "fallback": "en",
+        "fallback": null,
         "file": "ckb.json",
         "iso": "ckb",
         "name": "کوردی"
     },
     {
-        "code": "zh_Hans",
+        "code": "cs",
         "dir": "ltr",
-        "fallback": "en",
-        "file": "zh_Hans.json",
-        "iso": "zh_Hans",
-        "name": "简化字"
+        "fallback": null,
+        "file": "cs.json",
+        "iso": "cs",
+        "name": "Čeština"
     },
     {
         "code": "da",
         "dir": "ltr",
-        "fallback": "en",
+        "fallback": null,
         "file": "da.json",
         "iso": "da",
         "name": "Dansk"
     },
+    {
+        "code": "de",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "de.json",
+        "iso": "de",
+        "name": "Deutsch"
+    },
+    {
+        "code": "el",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "el.json",
+        "iso": "el",
+        "name": "Eλληνικά"
+    },
+    {
+        "code": "en",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "en.json",
+        "iso": "en",
+        "name": "English"
+    },
+    {
+        "code": "eo",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "eo.json",
+        "iso": "eo",
+        "name": "Esperanto"
+    },
+    {
+        "code": "es",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "es.json",
+        "iso": "es",
+        "name": "Español"
+    },
+    {
+        "code": "eu",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "eu.json",
+        "iso": "eu",
+        "name": "Euskara"
+    },
+    {
+        "code": "fa",
+        "dir": "rtl",
+        "fallback": null,
+        "file": "fa.json",
+        "iso": "fa",
+        "name": "فارسی"
+    },
+    {
+        "code": "fi",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "fi.json",
+        "iso": "fi",
+        "name": "Suomi"
+    },
+    {
+        "code": "fr",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "fr.json",
+        "iso": "fr",
+        "name": "Français"
+    },
     {
         "code": "gl",
         "dir": "ltr",
-        "fallback": "en",
+        "fallback": null,
         "file": "gl.json",
         "iso": "gl",
         "name": "Galego"
     },
+    {
+        "code": "he",
+        "dir": "rtl",
+        "fallback": null,
+        "file": "he.json",
+        "iso": "he",
+        "name": "עברית"
+    },
+    {
+        "code": "hi",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "hi.json",
+        "iso": "hi",
+        "name": "हिन्दी"
+    },
+    {
+        "code": "hu",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "hu.json",
+        "iso": "hu",
+        "name": "Magyar"
+    },
+    {
+        "code": "id",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "id.json",
+        "iso": "id",
+        "name": "Bahasa Indonesia"
+    },
+    {
+        "code": "it",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "it.json",
+        "iso": "it",
+        "name": "Italiano"
+    },
+    {
+        "code": "ja",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "ja.json",
+        "iso": "ja",
+        "name": "日本語"
+    },
+    {
+        "code": "kab",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "kab.json",
+        "iso": "kab",
+        "name": "Taqbaylit"
+    },
+    {
+        "code": "lt",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "lt.json",
+        "iso": "lt",
+        "name": "Lietuvių"
+    },
+    {
+        "code": "mk",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "mk.json",
+        "iso": "mk",
+        "name": "македонски"
+    },
+    {
+        "code": "nb-NO",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "nb_NO.json",
+        "iso": "nb-NO",
+        "name": "Norsk bokmål"
+    },
+    {
+        "code": "ne",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "ne.json",
+        "iso": "ne",
+        "name": "नेपाली"
+    },
+    {
+        "code": "nl",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "nl.json",
+        "iso": "nl",
+        "name": "Nederlands"
+    },
+    {
+        "code": "oc",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "oc.json",
+        "iso": "oc",
+        "name": "Occitan"
+    },
+    {
+        "code": "pl",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "pl.json",
+        "iso": "pl",
+        "name": "Polski"
+    },
+    {
+        "code": "pt",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "pt.json",
+        "iso": "pt",
+        "name": "Português"
+    },
+    {
+        "code": "pt-BR",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "pt_BR.json",
+        "iso": "pt-BR",
+        "name": "Português brasileiro"
+    },
+    {
+        "code": "ru",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "ru.json",
+        "iso": "ru",
+        "name": "Русский"
+    },
     {
         "code": "sk",
         "dir": "ltr",
-        "fallback": "en",
+        "fallback": null,
         "file": "sk.json",
         "iso": "sk",
         "name": "Slovak"
+    },
+    {
+        "code": "sl",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "sl.json",
+        "iso": "sl",
+        "name": "Slovenščina"
+    },
+    {
+        "code": "sv",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "sv.json",
+        "iso": "sv",
+        "name": "Svenska"
+    },
+    {
+        "code": "te",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "te.json",
+        "iso": "te",
+        "name": "Telugu"
+    },
+    {
+        "code": "tr",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "tr.json",
+        "iso": "tr",
+        "name": "Türkçe"
+    },
+    {
+        "code": "uk",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "uk.json",
+        "iso": "uk",
+        "name": "Українська"
+    },
+    {
+        "code": "zh_Hans",
+        "dir": "ltr",
+        "fallback": null,
+        "file": "zh_Hans.json",
+        "iso": "zh_Hans",
+        "name": "简化字"
     }
 ]