implemented tag cloud

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

frontend/src/Components/Menu.svelte

@@ -56,6 +56,7 @@ onMount(fetchModules);
     <a href="/company"  {onclick}>{t('companies')}</a>
     <a href="/project"  {onclick}>{t('projects')}</a>
     <a href="/task"     {onclick}>{t('tasks')}</a>
+    <a href="/tags"     {onclick}>{t('tags')}</a>
     <a href="/document" {onclick}>{t('documents')}</a>
     <a href="/bookmark" {onclick}>{t('bookmarks')}</a>
     <a href="/notes"    {onclick}>{t('notes')}</a>