A closer look
Cambridge-style notation would show translation as /trænzˈleɪʃ.ən/, main stress on lay, ending like shun. The dictionary offers separate UK and US audio, so check your variety.
Respellings such as tranz-LAY-shun are approximate, not precise phonetics. Say it in She checked the translation twice.
How the stress marks work
Read /ˈ/ as the strongest syllable marker and /ˌ/ as a weaker one, so the small mark before lay in /trænzˈleɪʃ.ən/ shows where to push.
Treat the /./ as a syllable break: it divides the word so you move through tranz, lay, shun as separate units instead of blurring the ending into the stressed part.
Feel the sequence in your mouth: start tranz with a short, relaxed vowel, let lay carry the lift, and let shun fade out quietly after it.