vitaliy_vorobyov 
By default testing is included in our localization services, but if you already have translated your product you can order it separately.
Localization testing is usually the final obligatory stage of product localization, and it ensures:
Localization Completeness
It is critically important to make sure that all UI elements are localized and nothing is left out. Mixed language IUs may spoil user's experience and harm your brand.
Consistency
Order linguistic testing for your localized product to be sure that all units of measurement, UI elements, and terms are consistent in all texts.
Appearance
After importing back into the software, GUI elements may be wrongly displayed. The cause could be the different length of a translated string, code limitations, or incorrect placement of tags or special symbols. Linguistic testing eliminates such bugs.
Local Standards
When you localize texts, it is important to comply with many minor local standards such as decimal symbols, whitespace characters, naming conventions, etc.