D22016: Fix typos, improve wording and fix theming issues.

[Carl Schwan]

ognarb added a reviewer:  KDE Promo.

REPOSITORY
  R935 Konsole Website

REVISION DETAIL
  https://phabricator.kde.org/D22016

To: ognarb, #kde_promo
Cc: konsole-devel, fbampaloukas, thsurrel, ngraham, maximilianocuria, hindenburg
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