More things

frontend/app/composables/useAppLocale.ts

@@ -24,7 +24,12 @@ function escapeHtml(text: string): string {
 }
 
 export function useAppLocale() {
-  const { locale, setLocale, t } = useI18n()
+  /* The global composer, not `useI18n()`: that one insists on a component
+     instance, and this composable also runs from the auth plugin, which has
+     none — a plugin runs in the Nuxt app's context, never in a `setup`. It is
+     the same composer `useI18n()` hands to a component anyway, since no part of
+     the wiki keeps messages of its own. */
+  const { locale, setLocale, t } = useNuxtApp().$i18n
 
   /* Translate a message that is drawn with v-html. Every interpolated value
      is escaped — tags, slugs and usernames wander into these — while the