Translation into 13 different languages...what are the pros and cons?

I am wondering if anyone has translated into any of the following languages:

• Oromo
• Amharic
• Kinyarwanda
• Kiswahili/Swahili
• Bangla/Bengali
• Indonesian Bahasa
• Sinhala
• Tamil

If so, are there any "lessons learned" or best practices that you can share?