Yes, all documents submitted will need to be translated to English.
For academic records such as diplomas and dean's letters, an official English translation is required if the original documentation is not in English.
When submitting any English translations, you will need to combine both the original untranslated copy along with the English-translated version into one file before uploading.
For any other requirements except academic records, most programs will usually accept self-translations. However, please be aware that there are some programs that require certified/official translations for other requirements. If this is the case, this would be mentioned in the program description, in the requirement's description, or by your AMO coach.
If you need official or certified translations, many trainees in the past have used www.StrakerTranslations.com.