User-Agent:       Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.1410.63 Safari/537.31
Build Identifier: 

Example:
A source string in plural form gets translated in a language with 2 plurals.
It then changed to singular form. The second translated string will still sit in database and when pulling, that second string will be attempted to be written out and cause an error in client (if download from UI it will silently fail and output a halfway file). 

Reproducible: Always

Steps to Reproduce:
1. Push a pot with one string in plural form
2. Pick a language that supports plural > 1
3. Translate the string and save
4. Change the pot and make the string singular
5. download from server
Actual Results:  
Downloaded file will stop at that string

Expected Results:  
When server generating the file it should ignore the unused plural translation and continue so that a complete po file gets written out. Meanwhile somehow inform the user this issue.