app install: support 'group' question + tweak label question

app/src/helpers/yunohostArguments.js

@@ -166,7 +166,7 @@ export function formatYunoHostArgument (arg) {
       }
     },
     {
-      types: ['select', 'user', 'domain', 'app'],
+      types: ['select', 'user', 'domain', 'app', 'group'],
       name: 'SelectItem',
       props: ['id:name', 'choices'],
       callback: function () {

app/src/i18n/locales/en.json

@@ -312,7 +312,8 @@
     "items_verbose_count": "There are {items}. | There is 1 {items}. | There are {items}.",
     "items_verbose_items_left": "There are {items} left. | There is 1 {items} left. | There are {items} left.",
     "label": "Label",
-    "label_for_manifestname": "Label for {name} (name displayed in the user portal)",
+    "label_for_manifestname": "Label for {name}",
+    "label_for_manifestname_help": "This is the name displayed in the user portal. This can be changed later.",
     "last_ran": "Last time ran:",
     "license": "License",
     "local_archives": "Local archives",
@@ -324,6 +325,7 @@
     "manage_apps": "Manage apps",
     "manage_domains": "Manage domains",
     "manage_users": "Manage users",
+    "manage_groups": "Manage groups",
     "migrations": "Migrations",
     "migrations_pending": "Pending migrations",
     "migrations_done": "Previous migrations",

app/src/views/app/AppInstall.vue

@@ -90,7 +90,8 @@ export default {
       manifest.install.unshift({
         ask: this.$t('label_for_manifestname', { name: manifest.name }),
         default: manifest.name,
-        name: 'label'
+        name: 'label',
+        help: this.$t('label_for_manifestname_help')
       })
 
       const {