Run this AppleScript in an Automator service to open selected text in Google Translate.

translate.applescript

-- Modified from http://scriptingosx.com/2016/01/build-a-google-translate-service/
on run {input, parameters}
	set theText to input as string
	set oldDelims to AppleScript's text item delimiters
	set AppleScript's text item delimiters to {return & linefeed, return, linefeed, "
", character id 8233, character id 8232}
	--  list of line break chars from http://stackoverflow.com/questions/12546253/how-to-replace-n-in-applescript#12546965
	set splitText to text items of theText
	set AppleScript's text item delimiters to {space}
	set theText to splitText as text
	set AppleScript's text item delimiters to oldDelims
	
	tell application "Safari"
		activate
		set d to make new document with properties {URL:"https://translate.google.com/#auto/en/" & theText}
	end tell
end run

No issue in macOS 11.3.1 with both the suggested apple scripts and the "Workflow receives current: text" option. Just make sure you create a Quick Action not a Workflow.