IdentityPage: Clarify English L10n:
- The header of the box which contains this string says "Change trust of identity '${nickname}'", so it is not a good idea to use 'of' again.
IntroduceIdentityPage: Add TODO of not hardcoding URIs
IdentityPage / KnownIdentitiesPage: Don't hardcode URI of IdentityPage, use getURI() instead.