Support Packages 

As of Basis Release 3.0D, SAP delivers Support Packages to remove any errors that appear in important transactions.
Support Packages may contain language-dependent data, such as message texts, ABAP texts or screen texts. Once you have used transaction SPAM to import a Support Package, the translated texts for these objects are up-to-date for all languages in the system.
Problems can occur if you want to import another language from the language CD into a system into which Support Packages have already been imported. The language CD is created before the first Support Packages, and the objects in the Support Packages are only translated into the languages already imported into the system. This means that when you then import another language, you affect the translations of the objects in the Support Packages. Texts may be outdated or missing altogether.
For detailed information and an overview of solutions in various releases, see SAP Note 352941.
As of Basis Release 4.6C, you can import language data from Support Packages to make your languages consistent.

Proceed as follows:

...

       1.      Call transaction SMLT.

       2.      Choose Language ® Special Actions ® Import Support Packages.