set label in hovercard for mentionings

src/Content/Item.php

@@ -432,6 +432,8 @@ class Item
 				$this->l10n->t('Network Posts') => $posts_link,
 				$this->l10n->t('View Contact') => $contact_url,
 				$this->l10n->t('Send PM') => $pm_url,
+				$this->l10n->t('Mention') => $mention_url,
+				$this->l10n->t('Post to group') => $mention_url,
 				$this->l10n->t('Block') => $block_link,
 				$this->l10n->t('Ignore') => $ignore_link,
 				$this->l10n->t('Collapse') => $collapse_link,