this text from  User Guide
The purpose of the “Form Localization” option is to allow you to define form elements in different languages based on the end user choice of language.
 In order to start localizing the form, click on the “+” symbol next to the “Form Localization” label. Note: To enable languages for your portal please refer to the DotNetNuke User Guide. You can install language packs under Admin, Languages. Once you have enabled additional language packs within your portal those languages will be available from the dropdownlist below."
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in From localization i should find all languages packs installed in dotnetnuke but i just find English languge
what is the problem ?

How many languages are installed? The localization should show all languages installed and enabled "except" for the default language.... The default language is not under localization because it uses the settings defined on the form questions / settings directly.

Thanks,

Chad