[ticket/8309] Renaming "Last visit" to "Last activity"

PHPBB3-8309
[ticket/8309] Rename $last_visit to $last_activity

PHPBB3-8309
[ticket/8309] Moving key to get keys in alphabetical order

PHPBB3-8309
[ticket/8309] Removing key with similar function to avoid redundancy

PHPBB3-8309
[ticket/8309] Changing $last_activity to $last_active

PHPBB3-8309
Merge pull request #2137 from geetakshi/ticket/8309

[ticket/8309] Rename "Last visited" to "Last activity" on memberlist/viewprofile
Revert "[ticket/11766] Hide edit, quote and delete buttons if topic is locked"

This reverts commit d71fd5d66091b0ea557ece2e53a02094415362d6.
Merge branch 'develop-olympus' into develop-ascraeus

* develop-olympus:
  Revert "[ticket/11766] Hide edit, quote and delete buttons if topic is locked"

Conflicts:
	phpBB/viewtopic.php
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  Revert "[ticket/11766] Hide edit, quote and delete buttons if topic is locked"