From Fedora Project Wiki

Adding Language Support:

Lets say we want to add xy_XY language support in Fedora. Following is to do list for adding language support in Fedora from i18n point of view:

Idea.png
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  • Rendering Engine support for Unicode code points of xy_XY (pango, qt)
  • Some Basic IME's for xy_XY(m17n-db)
  • Locale File for xy_XY in glibc
  • Updating comps file for xy_XY
  • Adding xy_XY in GDM list
  • Updating s-c-l locale-list file for xy_XY

Note: not complete, please add missing things here