feat(groups): configure message language per group instead of per route

Route.lang is removed; Group.lang now drives the message language for
every route in the group (default en, custom via KV i18n:<lang>).
dispatch.ts loads translations per group and falls back to en for
groups without a lang. Admin UI: GroupEditor gains the language field,
RouteEditor/RouteCard drop theirs; docs and config example updated.

admin/components/GroupEditor.vue

@@ -32,6 +32,27 @@
               <div class="hint">{{ t("groupEditor.idHint") }}</div>
             </div>
           </div>
+          <div class="row2">
+            <div class="field">
+              <label>{{ t("groupEditor.language") }}</label>
+              <input
+                v-model="form.lang"
+                type="text"
+                :placeholder="t('groupEditor.langPlaceholder')"
+              />
+              <div class="hint">{{ t("groupEditor.langHint") }}</div>
+            </div>
+            <div class="field">
+              <label
+                >{{ t("groupEditor.emoji") }}
+                <span class="lbl-note">{{ t("groupEditor.emojiNote") }}</span></label
+              >
+              <label class="inline">
+                <input v-model="form.emoji" type="checkbox" />
+                <span>{{ t("groupEditor.emojiLabel") }}</span>
+              </label>
+            </div>
+          </div>
           <div class="field">
             <label
               >{{ t("groupEditor.membersNote") }}
@@ -85,10 +106,6 @@
             </div>
             <div class="hint">{{ t("groupEditor.providersHint") }}</div>
           </div>
-          <label class="inline">
-            <input v-model="form.emoji" type="checkbox" />
-            <span>{{ t("groupEditor.emoji") }}</span>
-          </label>
           <div class="err">{{ formError }}</div>
         </form>
         <div class="editor-foot">
@@ -126,6 +143,7 @@ const form = reactive({
   owners: "",
   providers: [] as ("github" | "gitea")[],
   emoji: true,
+  lang: "",
 });
 
 function splitList(text: string): string[] {
@@ -154,6 +172,7 @@ watch(
       (p): p is "github" | "gitea" => p === "github" || p === "gitea",
     );
     form.emoji = g?.emoji ?? true;
+    form.lang = g?.lang ?? "";
     formError.value = "";
   },
 );
@@ -188,6 +207,7 @@ function save(): void {
     owners: props.superAdmin ? (owners.length ? owners : undefined) : props.group?.owners,
     providers: form.providers.length ? form.providers : undefined,
     emoji: form.emoji,
+    lang: form.lang.trim() || undefined,
   });
 }
 </script>

admin/components/RouteCard.vue

@@ -9,7 +9,6 @@
         <span v-if="readonly" class="dot" :class="route.enabled ? 'ok' : 'bad'"></span>
         <span class="route-name">{{ route.name || t("route.untitled") }}</span>
         <span class="route-id">{{ route.id }}</span>
-        <span v-if="route.lang" class="badge lang">{{ route.lang }}</span>
         <span
           v-for="(tg, i) in route.targets"
           :key="i"

admin/components/RouteEditor.vue

@@ -37,21 +37,10 @@
               required
             />
           </div>
-          <div class="row2">
-            <div class="field">
-              <label>{{ t("routeEditor.id") }}</label>
-              <input v-model="form.id" type="text" placeholder="my-route" required />
-              <div class="hint">{{ t("routeEditor.idHint") }}</div>
-            </div>
-            <div class="field">
-              <label>{{ t("routeEditor.language") }}</label>
-              <input
-                v-model="form.lang"
-                type="text"
-                :placeholder="t('routeEditor.langPlaceholder')"
-              />
-              <div class="hint">{{ t("routeEditor.langHint") }}</div>
-            </div>
+          <div class="field">
+            <label>{{ t("routeEditor.id") }}</label>
+            <input v-model="form.id" type="text" placeholder="my-route" required />
+            <div class="hint">{{ t("routeEditor.idHint") }}</div>
           </div>
           <div class="field inline">
             <input v-model="form.enabled" type="checkbox" />
@@ -211,7 +200,6 @@ function blankTarget(): TargetForm {
 const form = reactive({
   id: "",
   name: "",
-  lang: "",
   enabled: true,
   fallback: false,
   stop: false,
@@ -263,7 +251,6 @@ watch(
     const r = props.route;
     form.id = r?.id ?? "";
     form.name = r?.name ?? "";
-    form.lang = r?.lang ?? "";
     form.enabled = r?.enabled ?? true;
     form.fallback = r?.fallback ?? false;
     form.stop = r?.stop ?? false;
@@ -340,7 +327,6 @@ function collect(): Route | null {
     enabled: form.enabled,
     fallback: form.fallback || undefined,
     stop: form.stop || undefined,
-    lang: form.lang.trim() || undefined,
     discordRoleIds: discordRoles.length ? discordRoles : undefined,
     filters,
     targets,