translations PR 20180511 (#8774)

* translations PR 20180511

* Fix bad translations

i18n/nl.json

@@ -3812,7 +3812,7 @@
   },
   {
     "id": "app.plugin.activate.app_error",
-    "translation": "Unable to activate extracted plugin. Plugin may already exist and be activated."
+    "translation": "Unable to activate extracted plugin."
   },
   {
     "id": "app.plugin.cluster.save_config.app_error",
@@ -3846,10 +3846,6 @@
     "id": "app.plugin.get_plugins.app_error",
     "translation": "Unable to get active plugins"
   },
-  {
-    "id": "app.plugin.id_length.app_error",
-    "translation": "Plugin Id must be less than {{.Max}} characters."
-  },
   {
     "id": "app.plugin.install.app_error",
     "translation": "Unable to install plugin."
@@ -3858,6 +3854,10 @@
     "id": "app.plugin.install_id.app_error",
     "translation": "Unable to install plugin. A plugin with the same ID is already installed."
   },
+  {
+    "id": "app.plugin.invalid_id.app_error",
+    "translation": "Plugin Id must be at least {{.Min}} characters, at most {{.Max}} characters and match {{.Regex}}."
+  },
   {
     "id": "app.plugin.manifest.app_error",
     "translation": "Unable to find manifest for extracted plugin"