160 from internationalization to Provide a reference to language tags. Feedback by the 21 feb

Issues 160  from internationalization  to Provide a reference to language
tags as the key means to achieve the goal of unambigous text formatting
w3c/i18n-activity#957 <https://github.com/w3c/i18n-activity/issues/957>

I think this is a good idea.

We propose to add to 4.4.6.4 More Details
Use  language tags. Language tags are the key means to achieve the goal of
unambiguous text formatting. See [HTML language tags] and [BCP 47 Language
Codes].

Please send feedback by the 21 feb.  Otherwise we will assume you agree.

All the best
Lisa