CRM-12268 Also fixing minor layout problem for price set calculated totals on public pages, and add missing space in Membership form status msg.

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* CRM-12268: Completing a pay-later ignores the membership number of terms
  http://issues.civicrm.org/jira/browse/CRM-12268

ts() usage fixes. c.f. http://wiki.civicrm.org/confluence/display/CRMDOC43/Internationalisation+for+Developers

CRM-12233 Label for newly create quick config price fields for membership block should be Membership, not Membership Amount. Leaving the price_field.name as membership_amount since that's clearer as a machine name.

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* CRM-12233: Online membership signup - contribution amounts field should not be required + various notices
  http://issues.civicrm.org/jira/browse/CRM-12233

CRM-12113 Extend status message when attempting to deleting membership type to explain that contacts in trash may have membership type assigned. This has come up as a question several times on the forums.