Because the icons don't uniquely identify apps, we don't want to
minimize the shortcut text too much.
Rename center-header to center-info.
Minor adjustments to templates for readability.
Update changelog.
Remove unneeded gettext around configure URLs.
Remove module-level variables for configure URLs. Just use it directly
in add_shortcut().
Use reverse lookup for configure URLs.
Check that configure_url is set before displaying.
Change appearance of Configure link to a button.
- After the shortcuts were turned into a list instead of dictionary, the
descriptions stopped showing in the front page due to an 'in' check
that worked for dict. Fix this by changing the shortcuts into a
dictionary.
- Also make the key of the shortcut dict an 'id' instead of 'app' that
could create confusion how an app maps to a shortcut.
- Minor indentation fixes.
