Change verson switcher label to Versions

Signed-off-by: Julius Härtl <jus@bitgrid.net>

_shared_assets/themes/nextcloud_com/layout.html

@@ -147,7 +147,7 @@
       <div class="col-md-8">
         <h1><a href="{{ pathto(master_doc) }}">{{ project|e }}</a></h1>
         <div class="doc-version-switch">
-          Nextcloud versions: 
+          Versions: 
         {%- for v in doc_versions %}
           <a href="https://docs.nextcloud.com/server/{{ v }}/{{current_doc}}/{{pagename}}.html" {% if version == v %} class="current-doc"{% endif %}>{{v}}</a>
         {%- endfor %}