I loaded the same version as you are using, iGO 8.3.5.183522. It is
chas521's version, set up to use in the USA, with US English program language.
I only moved the Israel map into it, and created a route, using Hebrew keyboard.
The streets on the map are in English.
When I changed the program language to Hebrew, the street names are in Hebrew (obvious).
When I started the program for the first time, I had to set it up, since no "save" folder was inside. The screens I went through were different from recent versions, so I thought that this is a matter of dufferent/newer versions.
Now, after I tested it, I realize that both of you (you and chas521) are using Mio. So, maybe it's a matter of the device...