For most web games, for most game scripts, for a large number of mobile games, no, c++ is not the primary language.

Out of curiosity, what would you say is most common or appropriate language for these applications?

For most web games, for most game scripts, for a large number of mobile games, no, c++ is not the primary language.

Out of curiosity, what would you say is most common or appropriate language for these applications?

I mentioned several.

Flash, html+jJavaScript, and Java are all quite popular for web-based games. For mobile, although some C++ bindings are commonly used the native languages for Apple and Android are Objective C (which is a sibling to C++ also a sibling to modern C) and Java respectively.