Underline links on hover

Color change can be hard to notice.

No idea why they weren’t underlined before.
Remove link underline from icons
Remove post title from the comments title
Use the base line-height in the comments list
Add an icon to the comments title
Update comment meta styling

- Hide the “Says:” text string
- Use an icon on post author comments
- Use the Edit icon from Genericons for the edit link
Add an icon to the comment reply link and remove button styles
Minor comment styling updates
Add updated CSS missing from 93a13961cb90dd50046cd2a65445305e7f20fa73
Make sure the 'says:' in comments is readable by a screen-reader
Only show the markup for the recent posts if there's any posts
Fix styling issues with the Hybrid Core search widget
Move the search form CSS to its own file
Fix styling issues when primary menu is too long and the search form moves to the second line
Add grunt-wp-118n to generate the pot file needed for translations
Refresh translation files
Code cleanup