Prevent string cropping in bar widget and make practice button visible

In dashboard page, a couple of issues have been identified in collection widget.
1. When the translation of string "%1 word due" is slightly longer than the English one or %1 is a large number, string is cropped.
2. Practice button does not seem clickable, using the default breeze theme and reference theme of parley. Even worse, when breeze dark is used, due to the forcibly white background of collection widget, practice button text is unreadable.
I have addressed these issues by:
- Changing bar widget size to 2-lines, increasing also slightly the width of the collection widget
- Wrapping the text of bar widget
- Restoring theme colors to practice button (background was set to white due to collection widget white background)

REVIEW: 127561