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(cherry picked from commit db973456)

- Update date and verion numbers
- Remove an entity unused (kappname) and add more user entities
- Add some URLs with relevant information
- Improve some sentences and use highlighting for the Singmaster Notation
- Add a @title:window helper to GUI messages

(cherry picked from commit d443151d)

(cherry picked from commit f8799cf2)

They are the same on Linux (but DataLocation is deprecated). On Windows this enables the use of the roaming path.

NO_CHANGELOG

(cherry picked from commit 00b6f56b)

(cherry picked from commit 90b3a6a7)

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

(cherry picked from commit 1b3466e1)

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

(cherry picked from commit 30597761)

They do not belong to an user-facing documentation, but rather to
separate download/build development pages.

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

(cherry picked from commit 02ff2df2)

(cherry picked from commit 5af911c2)

Summary: When using fractional scaling, icons on the top are blurred. This patch fixes the issue.

Test Plan: No side effects.

Reviewers: #kde_games, yurchor

Reviewed By: yurchor

Subscribers: yurchor, kde-games-devel

Differential Revision: https://phabricator.kde.org/D29656

(cherry picked from commit de7aee38)