Automator > Services > Run Apple Script

AppleScript to translate English to German

on run {input, parameters}
    set phrase to input as string
    set phrase to quoted form of phrase

    set ui_lang to "en"
    set from_lang to "de"
    set to_lang to "en"

    do shell script "open 'https://translate.google.com/?hl='" & ui_lang & "'&sl='" & from_lang & "'&tl='" & to_lang & "'&text='" & phrase
end run    

File > Save

Run using Services menu

If you want to do this using Quick Look option;

Automator > Services > Run JavaScript

function run(input) {
	
	var output = "http://translate.google.com/#de/en/" + encodeURIComponent(input)

	return output;
}

OR for Seslisozluk

function run(input) {
	
	var output = "http://seslisozluk.com/" + encodeURIComponent(input)

	return output;
}

Add Library Window Popup

File > Save

Now the services are available through Right Click menu of selected text