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(cherry picked from commit 8d515faf)

(cherry picked from commit b88e61ee)

(cherry picked from commit 2a7da6e7)

(cherry picked from commit 4bd811ea)

(cherry picked from commit cc00d799)

(cherry picked from commit ba1bb4e7)

7004906e started to use targets instead
of sources variables, but missed a few spots, which caused the build to
fail.
ecm_add_app_icon(<target> ...) is only available since 5.83.0.

CCMAIL: montel@kde.org

(cherry picked from commit ad1db748)

(cherry picked from commit 98625346)

(cherry picked from commit 2ee52583)

(cherry picked from commit 645f2bd7)

(cherry picked from commit db28a8f1)

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 28a72c10)

(cherry picked from commit bffab95e)

(cherry picked from commit 69a5ad7f)