How can I backup (export to file) the predictive T9 dictionary?

[MinimalTech]

I want to do a factory settings reset (a.k.a. format) on my LG G2 (D802) but I don't want to loose my T9 custom dictionary (I have too many words added inside it).

How can I backup the T9 so to be able to import it again, after the factory settings reset completion?

My Android version is 4.4.2.

 

[MinimalTech]

Please help! I must do a reset, my android is in bad situation and my phone doesn't works properly...