The following is the language layout structure, where (xxx) is the
common english name of the language in question.

Base Localisation:
/language/(xxx)/*.php

Global Image Localisation:
/images/language/(xxx)/(xxx).gif

Theme Localisation:
/themes/language/lang-(xxx).php

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Modules Localisation:
/modules/[modulename]/language/(xxx)/*.php

Module Documentation:
/modules/[modulename]/manual/language/(xxx)/*.*

--------

Admin Base Localisation:
/modules/system/language/(xxx)/*.php

Admin Module Localisation:
/modules/system/admin/[modulename]/language/(xxx)/[modulename].php

Admin Module Documentation:
/modules/system/admin/[modulename]/manual/language/(xxx)/*.*
