Bug 20163: Position of NoLoginInstructions text is inconsistent

Bug 20163: Position of NoLoginInstructions text is inconsistent

This patch modifies the markup for two login forms, making the markup
more consistent between them. The order of NoLoginInstructions, "Forgot
your password?" and "Don't have an account?" should now be the same.

This patch also updates some classes in each login form to allow for
more consistent custom styling.  A couple of capitalization corrections
are included.

To test, enable the PatronSelfRegistration and OpacResetPassword
preferences. Put some text in the NoLoginInstructions preference.

View the login form as associated links on the OPAC main page. Compare
to the login form which appears in a modal window when you click the
login link at the top of the page. The two areas should look consistent.

Signed-off-by: Claire Gravely <claire.gravely@bsz-bw.de>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>