language issue

[Errol Sapir]

I use Kubuntu vivid in two languages. I have always used 2 languages and 
always have English (US) as my default language. Lately when installing 
some programs the Hebrew version - my other language and the area in 
which I live- has been installed. Is there a way to ensure installing 
the English version of a program. I get the in Hebrew no matter how I 
install the program, whether by apt-get, muon discover or direct from 
the site. It happened with Firefox and now again as I tried to install 
Qupzilla. Most of my programs are in English and suddenly I get this 
change of language which I cannot change out of. I still want to have 
dual language but not have Kubuntu decide what language to install a 
program.
TIA
Errol