Is considered as is an alternative way of saying the same thing. I don't see any problem with your example about French as a language of love, although it would more usually be phrased as the language of love.
The latter is considered to be far worse, so context is important, too. Most people would not use language that could be considered offensive by some in the workplace or in the company of people not well known to you, as you may not know how they personally feel about such words.
Using the word 'ass' to describe someone is considered vulgar in itself, but not severely so. Non-vulgar equivalents would be 'jerk', 'uncouth', etc. This is different from 'asshole', which usually is a mean and selfish person who does not mind causing offense or inconvenience to others. An asshole spreads conflict and misery wherever they go.
In the title, the correct and more grammatical way to say it is the second one. "Is" should be placed, because if not, the sentence would have more errors versus the other one. But if it is, it should be more "front" of the sentence. Example of this: "Why is that so scrambled?" vs "Why that is so scrambled?"
7 There actually does seem to be an explanation for the different spellings of speak and speech, and it even covers why speech would have variant spellings with
The theory: Considered + object Used when the subject should be just another name for something. Literally, that the object is the subject. He should be considered our leader since he makes all the decisions. = He is our leader. Considered + as + object Used when the object can be used to replace the subject. Indoor soccer should be considered as an alternative to outdoor soccer in winter ...