Bug 37404: Typo in intranetreadinghistory description

Bug 37404: Typo in intranetreadinghistory description

This patch corrects an error in the description of the
intranetreadinghistory system preference description.

To test:
1. Apply patch
2. Go to Administration > System preferences > Patrons
3. Look at the description of intranetreadinghistory
   --> It should say "... access a patron's checkout history..."
4. Make sure the description's spelling and grammar is correct

Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>