While translating existing text to other languages may seem easy, it is more difficult to maintain the parallel versions of texts throughout the life of the product. For instance, if a message displayed to the user is modified, all of the translated versions must be changed. This in turn results in somewhat longer development cycle.

Many localization issues (e.g. writing direction, text sorting) require more profound changes in the software than text translation. For example, OpenOffice.Org achieves this with compilation switches. 

To some degree (e.g. for Quality assurance), the development team needs someone who understands foreign languages and cultures and has a technical background. In large societies with one dominant language/culture, it may be difficult to find such a person.

Business Process for Internationalization Software
Cost vs benefit tradeoff
Difficultiesअडथळे/त्रास
Scope