[Tracker] MinWordLength of tracker-search-tool

["Chen, Zhenqiang" <zhenqiang chen intel com>]

Hi all, 

The default minimal word length of input string is 3 in tracker-fts.cfg. 

It maybe reasonable for most English words.  
But the length of lots lots of Chinese words is 2.

(1) Can we set different default values for different languages? 
e.g.
By default, when my inputs are all in English, the default is 3.
When my inputs are all in Chinese, the default is 2.
When they are mixed, select the minimal one. 

(2) Or set it from UI? 

Users set the value when searching.  

(3) others? 

> From my viewpoint, do not expect common users know how to 
change the default values from cmd line. 
Even from UI, some users might not know the exact meanings of MinWordLength. 


Thanks!
-Zhenqiang