Bug 11260: Follow up - normalizing frequencies in English sample file a bit

Bug 11260: Follow up - normalizing frequencies in English sample file a bit

After some discussion in IRC I am throwing in some changes for the
English sample frequencies:

- Change Vol to Vol.
- Change No to No.

We had both forms in the file, now it should be consistent.

To test:
- Run English web installer installing all sample files, especially
  frequencies
- Check installed frequencies
- Check available options creating a subscription

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>
(cherry picked from commit 66bf3abf78a7537201fd54be7b58fbab4c716b40)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>