Decimals parameter takes effect when compact option is off.

Decimals for non-compact numbers were being incorrectly removed.
Numbers were being rounded twice (123456789 -> 124k not 123k).
Numbers larger than 1 billion were being incorrectly shortened.

Also changed function qa_private_translate_with_progress to
qa_recalc_progress_lang

Improvements in how numbers are displayed

Fixes #216.

Add left padding to search field.
Slight refactoring of background CSS.
Closes #218, closes #221.

:before is not necessary. Split into multiple lines to aid future
additions.

Fixes #225.

Fixes #203.

Allows access from widgets, which get passed the theme object.
Fixes #207.

Fixed #206.

Fixes #195.

Closes #196.