"I have never valued insisting and requiring position from free software on internet. If you do not understand something for sure, better to ask questions rather making statements which can be rude and offend someone."
Agreed. Yes, it appeared you were taking the position that your software was not broken (without explaining why before) and that the problem was mine / with my css alone. This is why I did ask such questions pre-purchase.
While I was initially offended by your seemingly unfriendly / rude position, I can forgive that now. Your more verbose answer rather than the single sentence provided earlier clarified things much more than before and now appropriately puts the blame for the problem where it actually belongs (Google) instead of on me (the prospect).
Your free version may be all anyone is going to know about your product / company when they first find it even if they actually read the FAQ (don't count on it), no one would probably be able to know based on it that the free version is different in this respect from the PAID versions.
Perhaps you might consider adding a new FAQ question...
Q: "Why does the Free GTranslate add font tags to my HTML?"
Your own FAQ says "Can I test before making Payment?" - "You can test the free version. " Unfortunately, in the state which the free version currently exists, it doesn't give anyone a proper idea what to expect from the paid editions because of how it can break sites as we've now agreed here while the paid version will not. Therefore, it's not possible to really try it before purchase. Perhaps your decision use ioncube may make this even more difficult for you to do but perhaps you should consider making a true free version based on your paid versions (and really feature limited) rather than something that is just free.
Thanks for your answers!