Bug 21715: Ease translation of account and account offset type descriptions

Bug 21715: Ease translation of account and account offset type descriptions

This patch moves accounts-related descriptions into a single file to
ease finding them, and also encloses descriptions inside <span> tags to
make it easier to translate.

To test:
- Apply this patch
- Verify the templates work as expected
=> SUCCESS: No behaviour change
- Sign off :-D

Bonus: there were two cases in which the INCLUDE line used 'accountline'
as parameter, making it fail to pick the right account type!

Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>