Unit bug corrected, other languages are ok
Compiler warning removed for gcc 4.8.3
Proper rounding for values that are scaled down. Displayed and spoken values affected.

Example: value 3.47V was spoken as 3.4V, new spoken value is 3.5V
Merge pull request #848 from projectkk2glider/proper_rounding_of_spoken_values

Proper rounding of displayed and spoken values