My daughter can speak both French and English.
In many African countries, both English and French are used as their official languages.
Learning French is too difficult! I can’t take it anymore. Give me a break!
I bet you can guess that フランス means "France." So what happens when you add language to it? You get the "France Language" aka the French Language.
The reading is just the on'yomi reading for 語 which is the reading you learned with the kanji. This is probably because it gets added onto a lot of other words so it's treated like a jukugo. For example: 日本語 = "Japanese Language." 中国語 = "Chinese Language." スペイン語 = "Spanish Language."