I'll try to keep this short as possible to attract more people to this "question" we have in role playing accents or dialects in languages, in order to encourage more dialogue on the issues of this topic and hopefully a solution or defined rule to it. So basically I have seen a mixed usage of how people express different slang, accents, dialects, as well as, just another language itself, which I will address in a bulleted format.
Either a person will use /do Is speaking/speaks in [input language] or /me (which I think is incorrect anyways, as it used to describe actions or actions alone).
They will put their language before speaking as is shown in this example (Russian) I think I like candy more than life itself.
They will write in a foreign language I.E speak the language. For the case of slangs and accents, people will have either correctly or incorrectly used a slang (which by the way is not so easily researched on public forums on the internet besides having actual contact with such slang in OOC means- in my opinion).
Anyway, these three aforementioned bullet points are the examples in which I have seen then the use of slang/accents/languages. I would like some clarification for the topic so people can role play with more fluidity and provide a better general experience to people role playing people of different backgrounds.
For me personally I think this is an interesting topic to the roleplay community as I have done much research on the topic and have found little answers to this.