change party text to make it more obvious that you go to the party page to find invitations - fixes https://github.com/HabitRPG/habitrpg/issues/3934
Merge pull request #289 from Alys/partyJoin

change party text to to say you go to the party page to find invitations  - fixes https://github.com/HabitRPG/habitrpg/issues/3934