WowAce

Hello, it looks like current "AbbreviateName" function (modules\tags.lua, L369-372) treats each character as a single byte which breaks in languages using characters encoded in multiple bytes.

Function snippet:

-- Name abbreviation
local function abbreviateName(text)
	return string.sub(text, 1, 1) .. "."
end

Solution snippet:

local function utf8len1stchar(str)
    local byte = str:byte(1)
    if byte < 128 then return 1 end -- 1-byte character
    if byte < 224 then return 2 end -- continue of multi-byte character
    if byte < 240 then return 3 end -- start of 2-byte character
    if byte < 248 then return 4 end -- start of 3-byte character
    return 1 -- invalid
end

-- Name abbreviation
local function abbreviateName(text)
    local lengthOfFirstChar = utf8len1stchar(text)
    return string.sub(text, 1, lengthOfFirstChar) .. "."
end

 Solution PR on GH: 

https://github.com/Nevcairiel/ShadowedUnitFrames/pull/46