Fixes #546 - cleans up title attribute

- Removes `title` attribute where it is redundant with a link’s direct
content.
- Adds `title` attribute to buttons that do not contain text content.
- Rewords footer text mentioning grant to make `title` attribute
unnecessary.
- Removes `title` attribute from icons where a parent enclosing link also
had the same `title` attribute.
- Normalizes `title` attribute text to capitalize first letter.
Should this be more descriptive, like `Next page`, or `Next page of results`? Same with the "previous" link.