ThemeChooser: Remove unused string

Change-Id: I44a9be45e9e1df22a0ef70def8906270d29eba77
Automatic translation import

Change-Id: I14f7d0e678fa96a68cabd5d66bb5ae27389003b5
Themes: Let ThemeService handle all theme processing [2/3]

Change-Id: I0c9838920603a22acd16cd5f9d8a4f107af82968