[4.0] mod_article_news readmore missing string

[brianteeman]

Steps to reproduce the issue

create a module of type mod_article_news readmore
and make sure that you set it to show readmore
publish the module on a page that is NOT com_content

Expected result

readmore links displayed

Actual result

string is not translated

Additional comments

This was caused by my PR #30780 which switched to make sure the layout was used. However the layout requires the com_content language file.

The switch to use the layout was correct. So we have to either

1. change the strings to global strings
   or
2. always load the com_content language string with the module
   or
3. add the strings to the module language file

COM_CONTENT_READ_MORE="Read more ..."
COM_CONTENT_READ_MORE_TITLE="Read more: %s"
COM_CONTENT_REGISTER_TO_READ_MORE="Register to read more ..."

[richard67]

I vote for global strings.

[brianteeman]

See #31123