use messages for contacts tab title

www/common/translations/messages.json

@@ -987,6 +987,7 @@
     "share_linkPresent": "Present (hide editable sections)",
     "share_linkOpen": "Open in new tab",
     "share_linkCopy": "Copy to clipboard",
+    "share_contactCategory": "Contacts",
     "share_embedCategory": "Embed",
     "share_mediatagCopy": "Copy mediatag to clipboard",
     "loading_pad_1": "Initializing pad",