Bug 25630: Fix capitalization and terminology for OPAC system preferences

Bug 25630: Fix capitalization and terminology for OPAC system preferences

- Ending punctuation (p)
- Capitalization (c)
- Terminology: library instead of branch, patron instead of borrower,
  system preferences instead of syspref

To test:
- Verify:
  - OPACUserSummary (p, rephrase: mainpage)
  - HighlightOwnItemsOnOPACWhich (library)
  - OPACXSLTListsDisplay (p)
  - OPACXSLTResultsDisplay (p)
  - OPACXSLTDetailsDisplay (p)
  - OpacNoItemTypeImages (p)
  - NotHighlightedWords (p)
  - opaclayoutstylesheet (CSS)
  - OPACReportProblem (c)
  - OpacBrowser (p)
  - OpacCloud (p)
  - SocialNetworks (p)
  - QuoteOfTheDay (c,p)
  - OpacNewsLibrarySelect (library)
  - OPACFineNoRenewalsIncludeCredits (p)
  - AllowPurchaseSuggestionBranchChoice (p)
  - OpacHiddenItemsExceptions (p, patron)
  - OpacAllowPublicListCreation (p)
  - OpacAllowSharingPrivateLists (p)
  - BlockExpiredPatronOpacActions (whitespace)
  - MaxOpenSuggestions (p)
  - AnonSuggestions (p)
  - OPACPrivacy (p, whitespace)
  - AnonymousPatron (c,p)
  - TrackClicks (p)
  - RestrictedPageLocalIPs (p)
  - RestrictedPageTitle (p)
  - OpacAdvSearchOptions (p)
  - OpacAdvSearchMoreOptions (p)
  - PayPal* (p)
  - OPACUserSummary (mainpage to OPAC start page)
- read correctly.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>