Fix navigation theme preference heading

Inactive Accountrequested to merge
winh-navigation-theme-heading into master

What does this MR do?

Fix the translation of the navigation theme preference heading.

Screenshots

Before After
Screen_Shot_2018-06-04_at_22.29.33 Screen_Shot_2018-06-04_at_22.29.10

Does this MR meet the acceptance criteria?

Edited by Inactive Account

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