Remove all /en-US/ links from non en-US pages

[pdehaan]

via #202 (comment)

I'm proposing that all links should be de-localed so if I happen to be on a bn-BD privacy notice page and click a link, I wouldn't be taken to an en-US privacy policy doc (if a bn-BD translation was potentially available). For example:

[Mozilla গোপনীয়তা নীতি পড়ুন](http://www.mozilla.org/en-US/privacy/)

I think those links should just be tweaked to something like this, and let the site handle the redirect based on the user's current locale (or the best fallback, which may be en-US):

[Mozilla গোপনীয়তা নীতি পড়ুন](https://www.mozilla.org/privacy/)

---

Here was a list of all the files I could find in the legal-docs repo that mention "/en-US/" but weren't an en-US.md file:

$ grep -irl "/en-us/" . | grep -iv en-US.md$

./firefox_cloud_services_ToS/cs.md
./firefox_cloud_services_ToS/de.md
./firefox_cloud_services_ToS/el.md
./firefox_cloud_services_ToS/es.md
./firefox_cloud_services_ToS/fr.md
./firefox_cloud_services_ToS/hi.md
./firefox_cloud_services_ToS/hr.md
./firefox_cloud_services_ToS/hu.md
./firefox_cloud_services_ToS/it.md
./firefox_cloud_services_ToS/ja.md
./firefox_cloud_services_ToS/mk.md
./firefox_cloud_services_ToS/pl.md
./firefox_cloud_services_ToS/pt-BR.md
./firefox_cloud_services_ToS/ru.md
./firefox_cloud_services_ToS/sr-LATN.md
./firefox_cloud_services_ToS/ta.md
./firefox_cloud_services_ToS/zh-CN.md

./firefox_os_privacy_notice/bn-BD.md
./firefox_os_privacy_notice/bn-IN.md
./firefox_os_privacy_notice/cs.md
./firefox_os_privacy_notice/fr.md
./firefox_os_privacy_notice/hi.md
./firefox_os_privacy_notice/hr.md
./firefox_os_privacy_notice/ja.md
./firefox_os_privacy_notice/mk.md
./firefox_os_privacy_notice/ru.md
./firefox_os_privacy_notice/ta.md

./heartbleed_privacy_notice_en.US.md

./marketplace_developer_agreement/bn-BD.md
./marketplace_developer_agreement/bn-IN.md
./marketplace_developer_agreement/cs.md
./marketplace_developer_agreement/el.md
./marketplace_developer_agreement/es.md
./marketplace_developer_agreement/fr.md
./marketplace_developer_agreement/hi.md
./marketplace_developer_agreement/hr.md
./marketplace_developer_agreement/hu.html
./marketplace_developer_agreement/hu.md
./marketplace_developer_agreement/ja.md
./marketplace_developer_agreement/mk.md
./marketplace_developer_agreement/pl.md
./marketplace_developer_agreement/pt-BR.md
./marketplace_developer_agreement/ru.md
./marketplace_developer_agreement/sr.md
./marketplace_developer_agreement/ta.md
./marketplace_developer_agreement/zh-CN.md

./marketplace_privacy_policy/bn-BD.md
./marketplace_privacy_policy/bn-IN.md
./marketplace_privacy_policy/cs.md
./marketplace_privacy_policy/de.md
./marketplace_privacy_policy/es.md
./marketplace_privacy_policy/fr.md
./marketplace_privacy_policy/hi.md
./marketplace_privacy_policy/hr.md
./marketplace_privacy_policy/hu.md
./marketplace_privacy_policy/it.md
./marketplace_privacy_policy/ja.md
./marketplace_privacy_policy/mk.md
./marketplace_privacy_policy/pl.md
./marketplace_privacy_policy/ru.md
./marketplace_privacy_policy/sr.md
./marketplace_privacy_policy/ta.md
./marketplace_privacy_policy/zh-CN.md

./marketplace_terms_of_use/bn-BD.md
./marketplace_terms_of_use/bn-IN.md
./marketplace_terms_of_use/cs.md
./marketplace_terms_of_use/fr.md
./marketplace_terms_of_use/hi.md
./marketplace_terms_of_use/hr.md
./marketplace_terms_of_use/hu.md
./marketplace_terms_of_use/it.md
./marketplace_terms_of_use/ja.md
./marketplace_terms_of_use/mk.md
./marketplace_terms_of_use/ru.md
./marketplace_terms_of_use/sr.md
./marketplace_terms_of_use/ta.md
./marketplace_terms_of_use/zh-CN.md

./Mobile_Partner_Website_Branding_Terms/zh-CN.md

./mozilla_privacy_policy/bn-IN.md
./mozilla_privacy_policy/cs.md
./mozilla_privacy_policy/de.md
./mozilla_privacy_policy/es.md
./mozilla_privacy_policy/fr.md
./mozilla_privacy_policy/hi.md
./mozilla_privacy_policy/hr.md
./mozilla_privacy_policy/hu.md
./mozilla_privacy_policy/mk.md
./mozilla_privacy_policy/pl.md
./mozilla_privacy_policy/ru.md
./mozilla_privacy_policy/sr.md
./mozilla_privacy_policy/ta.md
./mozilla_privacy_policy/zh-CN.md

./README.md

[pdehaan]

Probably just a dupe of #185