I can see that you used all of the character count allocated for the trial membership in only 2 goes. You could go straight to paid PRO membership, but it, even though having a higher usage limit, still has one (at this moment it is 4 times higher than for the trial). The limit is in place since I am paying Google's translation service based on the number of characters used. I am gathering usage statistics to see how I can improve the add-on and make the quota high enough to satisfy as many users as possible not causing financial losses for me at the same time. For now, I am afraid, judging by your usage rate, even the paid option will not suffice your needs.
Thank you,