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

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

PHPBB3-8309
[ticket/11169] Move module 'prune users' to users category

PHPBB3-11169
[ticket/8309] Moving key to get keys in alphabetical order

PHPBB3-8309
[ticket/10590] Remove confirmation page after posting

PHPBB3-10590
[ticket/8309] Removing key with similar function to avoid redundancy

PHPBB3-8309
[ticket/10590] Fix functional tests are post confirm message removal

PHPBB3-10590
[ticket/12198] Language issue in en/common.php

Deleted lines as they are not needed anymore.

PHPBB3-12198
Merge branch 'nickvergessen/ticket/elsensee/10590' into ticket/10590
[ticket/12285] Fix mult-lingual issues between extensions

PHPBB3-12285
[ticket/11766] Hide edit, quote and delete buttons if topic is locked

But show quote button to guests if topic isn't locked

PHPBB3-11766
Merge remote-tracking branch 'Elsensee/ticket/11766' into develop-olympus

* Elsensee/ticket/11766:
  [ticket/11766] Hide edit, quote and delete buttons if topic is locked
Merge branch 'develop-olympus' into develop

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

Conflicts:
	phpBB/viewtopic.php
Merge remote-tracking branch 'netdeamon/ticket/12198-Language-issue' into develop

* netdeamon/ticket/12198-Language-issue:
  [ticket/12198] Language issue in en/common.php
[ticket/11169] Skip migration if "Users" category has been deleted

or the module has already been moved to that category

PHPBB3-11169
[ticket/8309] Changing $last_activity to $last_active

PHPBB3-8309
Merge pull request #2145 from Elsensee/ticket/10590

[ticket/10590] Remove confirmation page after posting
Merge remote-tracking branch 'Elsensee/ticket/11169' into develop

* Elsensee/ticket/11169:
  [ticket/11169] Skip migration if "Users" category has been deleted
  [ticket/11169] Move module 'prune users' to users category
Merge remote-tracking branch 'vsephpbb/ticket/12285' into develop

* vsephpbb/ticket/12285:
  [ticket/12285] Fix mult-lingual issues between extensions
Merge pull request #2137 from geetakshi/ticket/8309

[ticket/8309] Rename "Last visited" to "Last activity" on memberlist/viewprofile