Bug 33058: Update "fines" to "charges" for viewing a guarantees charges

Bug 33058: Update "fines" to "charges" for viewing a guarantees charges

Charges includes fines and fees, while fines are mostly
negative. Changing this according to our terminology
guidelines.

To test:
* Make sure the patron category of your patron is set
  to be 'can be guarantee' in administration
* Set  AllowStaffToSetFinesVisibilityForGuarantor and
   AllowPatronToSetFinesVisibilityForGuarantor to allow
* Set OpacPrivacy to allow
* Edit your patron, give it a guarantor and
  look at the "Show fines to guarantors setting" and hint
* Save and look at the label of the field on the details tab
* Go to the OPAC and log in
* Check the Privavy tab for the option to allow the guarantee
  to see your charges
* Apply patch. Verify:
  * System preference descriptions changes
  * Option and label names have changed in all steps above

Signed-off-by: Caroline Cyr La Rose <caroline.cyr-la-rose@inlibro.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>