[prep-release/1.0.3-pl1] Create prep-release branch

The 1.0.3-pl1 branch will include all changes that will added to
the STK which is released after phPBB 3.0.9. The changeset should
only include changes that can't be posponed until a future STK
release.
[bug/erik/62653] Fix incorrect include path
Revert "Refactor common.php"

This reverts commit 535c591eb7f5d3910d3ebc763003a35c3cb531a4.

Conflicts:

	install.txt
	stk/common.php
Merge branch 'bug/erik/62658' into prep-release/1.0.3-pl1
Merge branch 'bug/erik/62653' into prep-release/1.0.3-pl1

Conflicts:
	install.txt
added language/ja as translation of Japanese
[bug/erik/62663] Remove unused button
Merge branch 'bug/erik/62663' into stk/olympus
delete ja/tools/usergroup/resync_newly_registered.php
[Swedish Language Pack] Fresh upload for 1.0.3
Portuguese(pt) Translation
Brazilian Portuguese(pt-br) Translation
Merge branch 'intl-pt' of https://github.com/phpbbportugal/support-toolkit into language/pt
Merge branch 'intl-ja' of https://github.com/ocean0yohsuke/support-toolkit into language/ja
[bug/erik/62660] Support tab blank page

Under certain cirumstances it is possible that the database cleaner
file is included twice. Prevent the class from beining detected
twice if this happens. Patch by D¡cky
Merge branch 'bug/erik/62660' into prep-release/1.0.3-pl1
[stk/olympus] Fix typo in changelog
[bug/erik/62687] Fix undefined index
Merge branch 'bug/erik/62687' into prep-release/1.0.3-pl1
[bug/erik/62713] BBCode reparser guest posts

The BBCode reparser incorrectly handles guest posts.