So what i can suggest with XPATH is :
btn 1 : "//div[@class='valg'][position() = 0]/label/span[2]"
btn 2 : "//div[@class='valg'][position() = 1]/label/span[2]"
or in CSS selector
btn 1 : "div.valg:nth-child(1) label span.enighet"
btn 2 : "div.valg:nth-child(2) label span.enighet"
But i see that actually you have more div than what you've show. Tell me what's up.