Locales to deprecate:

Rationale: Hard to generate from cldr because they do not support some characters supported by the language.

It does not prevent from reading and writing files in those locales

  * zh_CN.GB18030
  * zh_CN.GB2312
  * zh_CN.GBK
  * zh_CN.eucCN
  * <del>zh_TW.Big5</del> [[https://svnweb.freebsd.org/changeset/base/315568|r315568]]
  * ja_JP.SJIS
  * ja_JP.eucJP
  * sr_RS.ISO8859-2
  * sr_RS.ISO8859-5
  * cs_CZ.ISO8859-2
  * da_DK.ISO8859-1
  * da_DK.ISO8859-15
  * hr_HR.ISO8859-2
  * hu_HU.ISO8859-2
  * nb_NO.ISO8859-1
  * nb_NO.ISO8859-15
  * sk_SK.ISO8859-2