Bug 17577: Improve sample notices for article requests

Bug 17577: Improve sample notices for article requests

- Adds "Dear..."
- Fixes capitalization
- Removes 'E-mail' from the description as you could also have
  a print template

To test:
- Make sure the SQL has no errors
- Install the letters and proof read them

If you agree - sign off!

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>