FIX: prevent lockup when impersonating disabled accounts

Closes #755

src/locales/de.json

@@ -510,6 +510,7 @@
     "lastname": "Nachname",
     "launchpad": "Launchpad",
     "loading": "Lädt",
+    "locked_impersonate_user_event": "Für das angegebene Konto liegt eine administrative Sperrung vor. Sie operieren nun wieder im Kontext Ihres eigenen Accounts.",
     "login": "Anmelden",
     "login_name": "Login Name",
     "logout": "Abmelden",

src/locales/en.json

@@ -507,6 +507,7 @@
     "lastname": "Lastname",
     "launchpad": "Launchpad",
     "loading": "Loading",
+    "locked_impersonate_user_event": "The given account was locked by an administrator. You are now operating again in the context of your personal account.",
     "login": "Login",
     "login_name": "Login name",
     "logout": "Logout",

src/vuex.js

@@ -96,6 +96,14 @@ const NetvsVuex = new Vuex.Store({
       } else {
         const lookup_result = await LoginService.get_mgr(state, payload)
         lookup_success = lookup_result.data && lookup_result.data.mgr_list && lookup_result.data.mgr_list.length > 0
+        if (lookup_success && lookup_result.data.mgr_list[0].is_adm_locked) {
+          EventBus.$emit('notify_user', {
+            title: i18n.t('views.app.user_locked'),
+            body: i18n.t('system.locked_impersonate_user_event'),
+            variant: 'danger'
+          })
+          return
+        }
       }
       if (lookup_success) {
         state.impersonate_user = payload