Modified the localization section

[GeorgeKerscher]

I merged 679 first, then commented out most of what was there. I reused much of the wording in the first few paragraphs. I put in a link to the localaziation area, which was a guess of what the URL might be. I used the same form as for implementations, and just switched out the last word.

[gautierchomel]

Preview:

5. Localization
   An ebook can be purchased in any country and be made available through a distributor or a library. Readers want consistent display of accessibility information that spans multiple languages, and that’s the primary role of this display guide. The wording of information provided to users proposed in this guide has been widely discussed by a large group representing different people in the English-speaking language group. The language has been improved after proof-of-concept translations and reviewed by panels of testers in several countries.
   It is understood that different countries or different target audience services may want to use specific language, and we have provided flexibility in the guide to accommodate this requirement. Simply translating the strings is not enough; the subtle meaning of the words and phrases of accessibility concepts must be localized for maximum understanding. Therefore, a mechanism is being provided for the publishing community to collaboratively deliver translations that localizes the strings for equally effective communication in any language. It is hoped that the localization area will become the defacto hub for development and distribution of language packs for each language and regional variation.
   Localization development and contributions area

[gautierchomel]

Shall we point the new repo? https://w3c.github.io/publ-a11y-display-guide-localizations/