OPAC Browse: Various interface improvements

OPAC Browse: Various interface improvements

  * Change of wording for the starts-with-article warnings, plus the
    addition of a link to browse with the same term without the article.

  * Forward button relabeled "Next", to be more consistent with other
    things.

  * Spinners for form submission and back/next buttons, done in a way
    similar to the OPAC search interfaces.

  * Apply the user setting 'opac.hits_per_page' to serve as the default
    number of browse hits per page when users are logged in.

  * Numbered browse results instead of bulleted.

  * Change of wording around the controls where the user enters browse
    terms and selects a search class and context location.

Signed-off-by: Lebbeous Fogle-Weekley <lebbeous@esilibrary.com>