well you can if you want to pay.
Google and bing both charge for that service on SL.... greedy b#$^ds
Anyway type in translator in search... under places your should find a sim that is giving out translator huds for free.
Only downsides are you have to read the manual that comes with it... click the ? when wearing to obtain the manual... to know how to set it up and you must make sure the power button icon is green and not red.
Also some languages come out compeletly messed up like Hindu for example can get really crazy if you try to translate it to english with the HUD.
And the HUD can crash with a script error, meaning it won't work until you relog, if there are people spamming gestures like crazy in a foriegn language.
Best advice is to try to learn the language, its both easier than the HUD and can help you in RL as well. Good Luck!