| Sources to create rules/languages file. | |
| Most latin1 based languages have utf8 alternatives named xx.utf8. Only name | |
| file xx.utf8 if it has xx also. Native UTF-8 languages should be named | |
| xx.utf-8. TextCat will convert xx.utf8 name into xx, as results will depend | |
| on normalize_charset and mail encoding. | |