settings: make most settings page center aligned

Méven Carrequested to merge
work/meven/settings-layout into master

Limit the width of text labels.

For consistency with Plasma systemsettings and Kirigami FormLayout.

before after
image image

After: image

image image image

There are two cases that I haven't touched here: view mode settings and trash.

Edited by Méven Car

Merge request reports