Add context for "Automatic" strings

Summary: "Some of these topics are masculine gender and others are feminine gender, as "automatic" should be. The result is that I can't translate "automatic" correctly in Spanish (and other languages)." -- Eloy Cuadra, Spanish translation coordinator

Test Plan: Should work as is.

Reviewers: #plasma, jgrulich!, davidedmundson, ngraham, ecuadra

Reviewed By: #plasma, davidedmundson, ngraham, ecuadra

Subscribers: ecuadra, plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D29359