Ok, the issue with fonts I managed to solve (I think) by installing WP Google fonts plugin and setting it to use PT Sans. I also had to enter custom CSS settings into plugin to force PT Sans also for site title as by default site title was very quickly loading 2 different fonts during F5. Fonts font that came with the theme didn’t display properly, even after updating them with versions which definitely support Unicode.
Regarding other issue with banner, I must admit I didn’t understand where to look for
tag wrapper I am suppose to remove?
On a unrelated issue, can you please also tell me how to force content bottom widgets, 4 of them to line up next to each other on lower resolutions? For instance if I look at the main page on a mobile device, below 1000px width, content bottom widgets line up above each other instead next to each other, although there is space for this.