Your directory (data/data/com.tomtom.gplay.navapp/database) is not the same as mine (\Android\data\com.tomtom.gplay.navapp\files\ on my Samsung S4 Android 4.4.2) but it seems to be the good directory.
"Content.db" file is an encrypted file => It's normal.

Use it with my script and tell me exactly what message you get (i you get an error message).
During the script, do you have a windows which tells you to select the voice (voice name is used) ?