DBLANG is the environment variable that points to the location where the message files are stored. Usually, the value of DBLANG corresponds with that of CLIENT_LOCALE. The value of DBLANG could be en_US.8859-1 or a value set according to X/Open standards for locale definitions. The locale is a set of files that defines the characteristics of a particular language (for example, French or Japanese), a particular territory (for example, France or Japan) and a particular code set (for example, MS Windows Code Page 1251 or ISO 8859-1). An example of a locale name for the French language in Canada that is encoded using ISO 8859-1 would be fr_CA.8859-1, and a locale name for the Japanese language that is encoded using EUC (Extended Unix Code) would be ja_JP.ujis.
Reexamine the value of the environment variables, DBLANG and CLIENT_LOCALE.