Bug 15300: Translatability: Replace ambiguous 'From' and 'To' in members-update.tt

 Bug 15300: Translatability: Replace ambiguous 'From' and 'To' in members-update.tt

This patch replaces semantically ambigous words "From" and "To" in
koha-tmpl/intranet-tmpl/prog/en/modules/members/members-update.tt
for better translatability.

To test:
- Apply patch
- Make sure that patrons can request detail changes in OPAC
  (sysprefs opacuserlogin, OPACPatronDetails)
- Log in to OPAC, request a change of personal details
  (cgi-bin/koha/opac-memberentry.pl)
- Log in to staff client
- Click link 'Patrons requesting modifications' or go to
  Home > Patrons > Update patron records
- Verify that table headers make sense

Signed-off-by: Hector Castro <hector.hecaxmmx@gmail.com>
Rewording Ok for translation purpose

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>