User settings for Unicode Math for em dash, en dash and special quotation marks used in English, Norwegian, French and Swedish.

UnicodeMath.sublime-settings

{
    "symbols": {
        "emdash": "\u2014", // —
        "endash": "\u2013", // –
        "laquo": "\u00AB", // «
        "raquo": "\u00BB", // »
        "ldquo": "\u201C", // “
        "rdquo":"\u201D", // ”
        "lsquo": "\u2018", // ‘
        "rsquo": "\u2019", // ’
        "ellipsis": "\u2026", // …
        "copyright": "\u00A9", // ©
        "x-mark": "\u2717", // ✗ a.k.a. UnicodeMath "\ballotx"
        "btc": "\u20bf", // ₿
        "trademark": "\u2122", // ™
        "registered": "\u00AE", // ®
        // Some Norse letters
        "Eth": "\u00D0", // Ð
        "eth": "\u00F0", // ð
        "Thorn": "\u00DE", // Þ
        "thorn": "\u00FE", // þ
        "Oogonek": "\u01ea", // Ǫ ⇒ "Norse Ø" or long o
        "oogonek": "\u01eb", // ǫ
        // Some Old English letters
        "ye": "\u0121", // ġ ⇒ ye/yi/j/dz
        "Ye": "\u0120", // Ġ
        "wynn": "\u01BF", // ƿ
        "Wynn": "\u01F7", // Ƿ
        // long wovels represented by macron diacritic
        "longa": "\u0101", // ā
        "longA": "\u0100", // Ā
        "longe": "\u0113", // ē
        "longE": "\u0112", // Ē
        "longi": "\u012B", // ī
        "longI": "\u012A", // Ī
        "longo": "\u014D", // ō
        "longO": "\u014C", // Ō
        "longu": "\u016B", // ū
        "longU": "\u016A", // Ū
        // C-cedilla
        "Cedilla": "\u00C7", // Ç
        "cedilla": "\u00E7", // ç
        "oelig": "\u0153", // œ
        "Oelig": "\u0152", // Œ
        // Scandinavian letters
        "Auml": "\u00C4", // Ä
        "auml": "\u00E4", // ä 
        "Ouml": "\u00D6", // Ö
        "ouml": "\u00F6", // ö
        "Oslash": "\u00D8", // Ø
        "oslash": "\u00F8", // ø
        "Aring": "\u00C5", // Å
        "aring": "\u00E5", // å
        "Aelig": "\u00C6", // Æ
        "aelig": "\u00E6", // æ
    }, 
    "synonyms": {
        "lq": "laquo",
        "rq": "raquo",
        "ls": "lsquo",
        "rs": "rsquo",
        "apostrophe": "rsquo",
        "rd": "rdquo",
        "ld": "ldquo",
        "mdash": "emdash",
        "md": "emdash",
        "em": "emdash",
        "ndash": "endash",
        "en": "endash",
        "el": "ellipsis",
        "Dh": "Eth",
        "dh": "eth",
        "Th": "Thorn",
        "th": "thorn",
        "Ø": "Oogonek",
        "ø": "oogonek",
        "xmark": "x-mark",
        "mith": "Planckconst",
        "tm": "trademark",
        "inf":"infty",
        "infinity":"infty",
        "plusminus":"pm",
        "done":"check",
        "W": "Wynn",
        "w": "wynn",
        "G": "Ye",
        "g": "ye",
        "ae": "aelig",
        "Ae": "Aelig",
        "aa": "aring",
        "Aa": "Aring",
        "Oe": "Oslash",
        "oe": "oslash",
        "Au": "Auml",
        "au": "auml",
        "Ou": "Ouml",
        "ou": "Ouml",
    }
}

A language focussed update with long vowels (as represented by a macron diacritic above them) and some Old English characters. And the cedilla. Previously Norse characters was added.