Languages in Brumaire

...and hopefully some world-building. Brumaire players, pick accordingly:

Brummish - replaces Common
The mongrel speech that dominates in modern Brumaire, a chimerical combination of the different tongues of humans who settled in Brumaire and they Fey tongues indigenous to the world. Whilst it serves as the legal and political language of the Kingdom of Brumaire in recent years, it lacks a standardised form and is highly informed by local variations of accent and dialect - often native speakers of Brummish from the Western and Eastern extremities of the Kingdom feel the other might as well be speaking High Fey or Gobbledegook. With the development of the printing press and growth in literacy, there has begun to be a growth of a codified grammar and syntax in elite speakers of Brummish, and it has been considered in vogue for a few years amongst the Greatest Estate to imitate the Brummish dialect spoken in the capital province of Ildemaire. The average human citizen of the Kingdom has taken no notice of this. Insults and swearing derived from Gobbledegook are a common motif in Brummish, whereas words for arcane or legal concepts tend to derive from HIgh Fey. The written form of Brummish derives from runes used by the human settlers in Brumaire.

Lashkarish - replaces Orcish 
The camp-language of Marmelukes and soldiers which is a simplified, more practical version of Brummish deliberately engineered to drop many abstract concepts (freedom, honour, faith) in favour of practical reality. In battle, it tends of be information-rich in very few syllables, but struggles with nuance, shades of meaning and emotion -  almost all adjectives and adverbs in Lashkarish are imperfect borrowings from Brummish or Gobbledegook. Despite the intended spartan construction of this artificial language, it has grown to contain an inordinately large vocabulary of profanity, curses and scatalogical language - many lords of the Greatest Estate will swear only in Lashkarish.

High Fey  - replaces Sylvan
The traditional and culturally elevated speech of the Courts of Fey-kind, this lyrical language has a tight and highly prescriptive structure, and makes heavy use of metaphor, idiom and allusion. Reiterating traditional allusions or motifs is considered highly prestigious whilst originality of speech is considered to debase the language. This makes the language difficult to translate, read or write and it is somewhat impractical for daily use, but in retains its position as the pre-eminent language of diplomacy, literature and law in the Courts, despite having no written form. In fact, their prescriptive, highly structured nature tends to make it easy to remember lengthy epic compositions or legal texts from memory - a highly prestigious feat in the Fey courts.

Low Fey - replaces Elven
More common among rural and Wild Fey is Low Fey, a far less elevated language which retains much of the language of High Fey but greatly simplifies the complex grammatical structures and loses much of the different conjugations relating to status, social relationships or idiomatic motifs. It even founds use among the Fey courts as a language of everyday life and mundane interactions.

Gutter Fey  or Craft Fey- replaces Dwarven
This is the urban language of Fey who are mostly acclimatised to living amongst the humans of Brumaire - it derives most of its lexis from High Fey but borrows the simpler and freer grammar of Brummish to make for a more accessible language for the masses. Many Brummish words for technical or mechanical concepts derive from Gutter Fey, and most mechanical or craft manuals are published in this language by the highly industrious Dwarven communities in major cities, who have rapidly capitalised on the printing press and their own monopolistic influence on many craft-guilds to corner that market. This is the holy language of the cult of  Myrioi, Lady Progress.

Jotunnish - replaces Giantish
The shaggy haired giants are not technically Fey, thought many of them accept the sovereignty of the Courts, and have been roughly intergrated into Fey society or live wild in places distant from human habitation. Their own speech of Jotunnish is a rapidly dying language as distinct Giant communities become rarer and rarer, and much of their oral tradition is being increasingly lost.

Gobbledegook - replaces Goblin
The language of Goblin tribes, initially a dialect of Low Fey, which the Goblin tribes have retained and cultivated as a signifier of their seperation from human settlements and the traditional power structures of the Fey Courts. A language of extravagant bombast and hyperbole where many sounds are produced only out of one side of the mouth or with a distinctive clicking of tongue-on-fang. This makes it an extremely difficult language for most other races to master, which is a source of much pride for Goblinkind.