a box to tick in on a form
I think you mean "l'argent". In which case, l'argent means money.
It's for if you can't find a good translation. In this case you speak English and you want to know a word in french.
It means 'in my bag' in French. Dans mon sac j'ai ... means "In my bag I have ..."
la règle (fem.) is either the ruler (in your pencil case) or the rule (law or obligation) in French.
I am assuming you meant 'jolie', in which case it means 'pretty' in the feminine form.
Une trousse (fem.) is a pencil case in English.
"La case" in French can refer to a small hut or cabin, typically found in tropical regions. It is often made from natural materials such as wood or bamboo.
It literally means "that we". I'm a Francophone from Québec, in case you want to be sure of my accuracy :)
une fête is a celebration or a party in French.
By Horn, I assume you mean French Horn, in which case the answer would be no, it is a brass instrument.
By "connor", I assume you mean "connard". In which case, "connard" is an insult, and can translate roughly to "idiot". If you mean "Connor" as a person's name, it would be "Conner". Names do not translate.
It's for if you can't find a good translation. In this case you speak French and you want to know a word in Spanish.