Add label to object which has no text label

Add label to object which has no text label

- Issue:
The utterance about number is not recognized in text label mode.

- Solution:
This patch adds label information for the objects which have no label
information. For these objects, mmi manager uses index information as
label information. Through this patch, number utterance in text label
mode is properly recognized. However, some utterance like '7번' can not
be recogntized yet.

Change-Id: I9fc025638a479d210f644dc5f47b12ed5f435ac3
Signed-off-by: Suyeon Hwang <stom.hwang@samsung.com>