Plan 0.5.0 from the ten highest-scoring items; reserve the plugin id error, translate the duplicate-group refusal, and correct four comments and README passages

examples/plugins/admin/admin-groups.ts

@@ -364,7 +364,7 @@ export const groupsCreate = withGroups(async (deps) => {
   const reject = async (error: string): Promise<RouteResult> => ({ ...(await groupFormResult(deps, { error, values: { member, name } })), status: 400 });
   if (!isValidGroupName(name)) return reject(ctx.t("admin.groups.validation.name"));
   if (!tuple) return reject(ctx.t("admin.groups.validation.member"));
-  if (await groupExists(keto, name)) return reject("A group with that name already exists.");
+  if (await groupExists(keto, name)) return reject(ctx.t("admin.groups.error.duplicate"));
   await keto.writeTuple(tuple);
   ctx.log.info("admin: group created", { actor: user.id, group: name });
   return { redirect: detailHref(name) };

examples/plugins/admin/i18n/en-US.ts

@@ -68,6 +68,7 @@ const messages = {
   "admin.groups.create": "Create group",
   "admin.groups.delete": "Delete group",
   "admin.groups.deleteMessage": "Delete group {{name}}? This can't be undone.",
+  "admin.groups.error.duplicate": "A group with that name already exists.",
   "admin.groups.error.selfLockout": "This change would lock you out of {{permissions}}, which you hold through this group. Ask another administrator to make it.",
   "admin.groups.field.name": "Group name",
   "admin.groups.field.nameHint": "Lowercase letters, digits, dashes and underscores.",

examples/plugins/admin/i18n/sv-SE.ts

@@ -68,6 +68,7 @@ const messages: AdminMessages = {
   "admin.groups.create": "Skapa grupp",
   "admin.groups.delete": "Radera grupp",
   "admin.groups.deleteMessage": "Ta bort gruppen {{name}}? Det går inte att ångra.",
+  "admin.groups.error.duplicate": "Det finns redan en grupp med det namnet.",
   "admin.groups.error.selfLockout": "Ändringen skulle låsa ute dig från {{permissions}}, som du har genom den här gruppen. Be en annan administratör att göra den.",
   "admin.groups.field.name": "Gruppnamn",
   "admin.groups.field.nameHint": "Små bokstäver, siffror, bindestreck och understreck.",