Make plugin titles and descriptions consistent in casing and wording

Summary:
Before:

{F6414381}

After:

{F6414375}

Note:
- Replicode seems to be unmaintained, see https://github.com/sandsmark/replicode

Reviewers: #kate, #vdg, ngraham

Reviewed By: #vdg, ngraham

Subscribers: dhaumann, ngraham, kwrite-devel

Tags: #kate

Differential Revision: https://phabricator.kde.org/D16647