Merge pull request #729 from vector-im/dbkr/minor_a11y_fixes

A couple of minor a11y fixes

public/locales/en-GB/app.json

@@ -31,6 +31,7 @@
   "Confirm password": "Confirm password",
   "Connection lost": "Connection lost",
   "Copied!": "Copied!",
+  "Copy": "Copy",
   "Copy and share this call link": "Copy and share this call link",
   "Create account": "Create account",
   "Debug log": "Debug log",
@@ -40,6 +41,7 @@
   "Developer": "Developer",
   "Display name": "Display name",
   "Download debug logs": "Download debug logs",
+  "Element Call Home": "Element Call Home",
   "Entering room…": "Entering room…",
   "Exit full screen": "Exit full screen",
   "Fetching group call timed out.": "Fetching group call timed out.",