Link checker: Some UI tweaks suggested by George Duimovich

Link checker: Some UI tweaks suggested by George Duimovich

  - Make the "Filter" link above FlattenerGrids a button and not a link.

  - Instead of IDs as links in some grid columns, have the ID show up in
    plain text and have links with a more descriptive name sit next to the
    ID.

  - Correct the settings for saving grid columns on the Select URLs and
    Review Attempt interfaces.

  - Tiny i18n fixes (page titles)

  - Fix lack of horizontal scrollbar on Select URLs interface, and also
    fix the way that if you clicked on said scrollbar in a case where
    your grid was taller than your browser window, the page would
    automatically scroll up to focus on your grid header row, and you
    couldn't actually manipulate the horizontal scrollbar.  We sadly
    pay for our horiz scrollbar with a doubled vertical scrollbar, but
    possibly someone can figure the Right way to fix such layout
    problems, which actually occur widely in similar interfaces in
    Evergreen.

  - Add buttons to download CSV on Select URLs and Review Attempt
    interfaces.

Signed-off-by: Lebbeous Fogle-Weekley <lebbeous@esilibrary.com>
Signed-off-by: Mike Rylander <mrylander@gmail.com>