Revert "cp of dspace-xmlui-webapp/.../Mirage/.../forms.xsl to the dspace/modules/xmlui dir for modification: do not repeat email help text on login-help page"

This reverts commit 8e33ce9af55fac5efbb4ae963f0ad5a0f5d8194b,
since the change was made in the dri2xhtml-alt/core/forms.xsl.
change 'Login' to 'Log in' on log-in screen
sentence-case 'Log In' and 'Sign Up' in Dryad page header
suppress first help message on forgot-password page