need more prefixes for table summaries and image descriptions

[vinsci]

 http://plone.org/development/i18n/translators-guidelines lists some prefixes to use for msgid:s. There are currently no prefixes defined for the <table> summary attribute, nor for the <img> alt attribute.

[dn]

AFAIK we can start using msgids for attributes with Zope > 2.7. So this is probably not for 2.0.

[hannosch]

I have started doing this for all table summaries with a summary_ prefix adding some missing summaries along the way.

What do we want to use for image titles and alt attributes? image_?

This won't be resolved completly in 2.1 but should be done in the 2.1-series.

[hannosch]

There are also a lot of titles, which I have begun to convert from literal to non-literal msgid's with prefix 'title_'

[hannosch]

Fixed in SVN :) There are no literal msgid's left in templates.