On the fly translation, AutoHotKey;

; By balawi28
; Forked by Valravn, from original:https://github.com/balawi28/AHKFastTranslator
; Stripped everything, this is an app with no gui. Win+R and type shell:startup, paste the executable there for it to start at system start
; you can compile different executables with different target langs and different shortcuts for each!

; Hotkey: Ctrl+Shift+T


dict := GetLanguagesDict()

SourceLang := "English"
TargetLang := "Swedish"

^+t::
{
    ; Clear clipboard
    Clipboard := ""
    ; Copy selected text
    Send ^c
    ; Wait for clipboard to contain data
    ClipWait 2

    if (Clipboard != "")
    {
        TextToTranslate := Clipboard
        url := TranslateURL(dict[SourceLang], dict[TargetLang], TextToTranslate)
        response := PostRequest(url)
        cleanResponse := SubStr(response, 3, StrLen(response) - 4)
        ; Replace clipboard with translation
      	Clipboard := cleanResponse
        ; Paste translation
        Send ^v
    }
}
return

EncodeParams(params)
{
    encodedParams := ""
    for key, value in params
    {
        encodedKey := key
        encodedValue := value
        encodedParams .= (encodedParams = "") ? encodedKey . "=" . encodedValue : "&" . encodedKey . "=" . encodedValue
    }
    Return encodedParams
}
PostRequest(url){
    response := ComObjCreate("WinHttp.WinHttpRequest.5.1")
    response.Open("POST", url, false)
    response.Send()
    Return response.ResponseText
}
TranslateURL(sourceLang, targetLang, textToTranslate)
{
    baseUrl := "http://translate.google.com/translate_a/t?"
    params := []
    params["sl"] := sourceLang
    params["tl"] := targetLang
    params["uptl"] := targetLang
    params["q"] := UriEncode(textToTranslate)
    params["client"] := "p"
    params["hl"] := "en"
    params["sc"] := "2"
    params["ie"] := "UTF-8"
    params["oe"] := "UTF-8"
    params["oc"] := "1"
    params["prev"] := "conf"
    params["psl"] := "auto"
    params["ptl"] := "en"
    params["otf"] := "1"
    params["it"] := "sel.8936"
    params["ssel"] := "0"
    params["tsel"] := "3"
    Return baseUrl . EncodeParams(params)
}

; UriEncode function is written by the-Automator
; https://www.the-automator.com/parse-url-parameters/
UriEncode(Uri, RE="[0-9A-Za-z]")
{
    VarSetCapacity(Var, StrPut(Uri, "UTF-8"), 0)
    StrPut(Uri, &Var, "UTF-8")
    While Code := NumGet(Var, A_Index-1, "UChar")
    {
        Res .= (Chr := Chr(Code)) ~= RE ? Chr : Format("%{:02X}", Code)
    }
    Return Res
}
GetLanguagesDict(){
    global dict
    if !dict {
        dict := {}
        dict["_Auto Detect_"] := "auto"
        dict["Afrikaans"] := "af"
        dict["Albanian"] := "sq"
        dict["Amharic"] := "am"
        dict["Arabic"] := "ar"
        dict["Armenian"] := "hy"
        dict["Assamese"] := "as"
        dict["Aymara"] := "ay"
        dict["Azerbaijani"] := "az"
        dict["Bambara"] := "bm"
        dict["Basque"] := "eu"
        dict["Belarusian"] := "be"
        dict["Bengali"] := "bn"
        dict["Bhojpuri"] := "bho"
        dict["Bosnian"] := "bs"
        dict["Bulgarian"] := "bg"
        dict["Catalan"] := "ca"
        dict["Cebuano"] := "ceb"
        dict["Chinese (Simplified)"] := "zh-CN"
        dict["Chinese (Traditional)"] := "zh-TW"
        dict["Corsican"] := "co"
        dict["Croatian"] := "hr"
        dict["Czech"] := "cs"
        dict["Danish"] := "da"
        dict["Dhivehi"] := "dv"
        dict["Dogri"] := "doi"
        dict["Dutch"] := "nl"
        dict["English"] := "en"
        dict["Esperanto"] := "eo"
        dict["Estonian"] := "et"
        dict["Ewe"] := "ee"
        dict["Filipino (Tagalog)"] := "fil"
        dict["Finnish"] := "fi"
        dict["French"] := "fr"
        dict["Frisian"] := "fy"
        dict["Galician"] := "gl"
        dict["Georgian"] := "ka"
        dict["German"] := "de"
        dict["Greek"] := "el"
        dict["Guarani"] := "gn"
        dict["Gujarati"] := "gu"
        dict["Haitian Creole"] := "ht"
        dict["Hausa"] := "ha"
        dict["Hawaiian"] := "haw"
        dict["Hebrew"] := "he"
        dict["Hindi"] := "hi"
        dict["Hmong"] := "hmn"
        dict["Hungarian"] := "hu"
        dict["Icelandic"] := "is"
        dict["Igbo"] := "ig"
        dict["Ilocano"] := "ilo"
        dict["Indonesian"] := "id"
        dict["Irish"] := "ga"
        dict["Italian"] := "it"
        dict["Japanese"] := "ja"
        dict["Javanese"] := "jv"
        dict["Kannada"] := "kn"
        dict["Kazakh"] := "kk"
        dict["Khmer"] := "km"
        dict["Kinyarwanda"] := "rw"
        dict["Konkani"] := "gom"
        dict["Korean"] := "ko"
        dict["Krio"] := "kri"
        dict["Kurdish"] := "ku"
        dict["Kurdish (Sorani)"] := "ckb"
        dict["Kyrgyz"] := "ky"
        dict["Lao"] := "lo"
        dict["Latin"] := "la"
        dict["Latvian"] := "lv"
        dict["Lingala"] := "ln"
        dict["Lithuanian"] := "lt"
        dict["Luganda"] := "lg"
        dict["Luxembourgish"] := "lb"
        dict["Macedonian"] := "mk"
        dict["Maithili"] := "mai"
        dict["Malagasy"] := "mg"
        dict["Malay"] := "ms"
        dict["Malayalam"] := "ml"
        dict["Maltese"] := "mt"
        dict["Maori"] := "mi"
        dict["Marathi"] := "mr"
        dict["Meiteilon (Manipuri)"] := "mni-Mtei"
        dict["Mizo"] := "lus"
        dict["Mongolian"] := "mn"
        dict["Myanmar (Burmese)"] := "my"
        dict["Nepali"] := "ne"
        dict["Norwegian"] := "no"
        dict["Nyanja (Chichewa)"] := "ny"
        dict["Odia (Oriya)"] := "or"
        dict["Oromo"] := "om"
        dict["Pashto"] := "ps"
        dict["Persian"] := "fa"
        dict["Polish"] := "pl"
        dict["Portuguese"] := "pt"
        dict["Punjabi"] := "pa"
        dict["Quechua"] := "qu"
        dict["Romanian"] := "ro"
        dict["Russian"] := "ru"
        dict["Samoan"] := "sm"
        dict["Sanskrit"] := "sa"
        dict["Scots Gaelic"] := "gd"
        dict["Sepedi"] := "nso"
        dict["Serbian"] := "sr"
        dict["Sesotho"] := "st"
        dict["Shona"] := "sn"
        dict["Sindhi"] := "sd"
        dict["Sinhala (Sinhalese)"] := "si"
        dict["Slovak"] := "sk"
        dict["Slovenian"] := "sl"
        dict["Somali"] := "so"
        dict["Spanish"] := "es"
        dict["Sundanese"] := "su"
        dict["Swahili"] := "sw"
        dict["Swedish"] := "sv"
        dict["Tagalog (Filipino)"] := "tl"
        dict["Tajik"] := "tg"
        dict["Tamil"] := "ta"
        dict["Tatar"] := "tt"
        dict["Telugu"] := "te"
        dict["Thai"] := "th"
        dict["Tigrinya"] := "ti"
        dict["Tsonga"] := "ts"
        dict["Turkish"] := "tr"
        dict["Turkmen"] := "tk"
        dict["Twi (Akan)"] := "ak"
        dict["Ukrainian"] := "uk"
        dict["Urdu"] := "ur"
        dict["Uyghur"] := "ug"
        dict["Uzbek"] := "uz"
        dict["Vietnamese"] := "vi"
        dict["Welsh"] := "cy"
        dict["Xhosa"] := "xh"
        dict["Yiddish"] := "yi"
        dict["Yoruba"] := "yo"
        dict["Zulu"] := "zu"
    }
    Return dict
}