Update plugin_strings.ini

Thanks @KirillMysnik

Author: invincibleqc

resource/source-python/translations/_core/plugin_strings.ini

@@ -11,7 +11,7 @@ de = "Lade Plugin '{plugin}'..."
 fr = "Chargement du plugin '{plugin}'..."
 nl = "Plugin '{plugin}' aan het laden..."
 ru = "Загрузка плагина '{plugin}'..."
-es = "Cargando el plugin '{plugin}...'"
+es = "Cargando el plugin '{plugin}'..."
 
 [No Module]
 en = "Unable to load plugin '{plugin}'. Missing file ../{file}"