Use Yahoo on metager.org

We will limit the detected list of GEOs to the following list for now

1. US => USA
2. GB => Great Britain
3. IE => Ireland
4. AU => Australia
5. NZ => New Zealand

Default will be US

assigned to @dominik

created branch 1214-use-yahoo-on-metager-org to address this issue

mentioned in merge request !1997 (merged)

mentioned in commit dc9bfc51

closed with merge request !1997 (merged)

mentioned in commit d0f405d7