Calling tr() from a file-scope array isn't advisable, since it can be
executed before the Qt libraries are even fully initialized, which can
lead to crashes.

Instead, the translatable strings should be annotated, and the tr()
function should be called at the string's usage site.

Greatly simplifies the current input UI, while still allowing power users to tweak advanced settings. Adds 'input profiles', which are easy autoconfigurations to make getting started easy and fast. Also has a custom option which brings up the current, full UI.