Translate custom button and custom liquid to arabic

[Bochiii]

Hi 
I have this code i wrote it in header.liquid 

<button class="mybuttoncss" type="button" onclick="window.location.href='https://twiceco.com/pages/%D9%82%D8%AF%D9%85-%D8%B9%D8%B1%D8%B6';" > {{ 'Details of Request' }}</button>

How can i translate Details of Request to Arabic

Also In form i wanna change this from comment to details of request then translate to Arabic

<label class="form__label field__label" for="ContactForm-body">
          {{- 'templates.contact.form.comment' | t -}}
        </label>

Thanks for helping