Every piece of text a customer reads on the COD form can be set per language. Open COD Form → Translations. The language picker at the top starts with Default, your storefront's own language, and then offers well over a hundred more in two groups, Used languages and Other languages. A group with nothing in it is not shown at all.
The labels you typed on Form customization are the default texts. The field manager reminds you of this with the note "You are editing form labels for the ... language. To set texts for other languages", followed by a go to Translations link. Get the wording right in your main language first, because everything else is translated from it.
Translations are split into Fields, Sections, Buttons, Messages, Custom fields and Partial payment. Fields covers labels and placeholders, Sections the headings such as the shipping and totals titles, Buttons the pop-up and submit buttons, and Messages the validation errors. Custom fields only appears once your form has one. Each row shows the original text above the box, so you always know what you are translating.
Saving reports Translations saved. If it fails you get "Error while saving translations. Please try again." Then open your storefront in that language and read the form end to end. Any text you have not translated falls back to the default, so an untranslated line shows up immediately.
On the Form customization tab there is a card called Language direction, with the note "Affects the form layout (RTL for Arabic languages)". Switching to right to left mirrors the layout. Underneath, Fields in LTR is marked Recommended and keeps chosen inputs left to right, with separate switches for Email and Phone. Both are on by default.
Translating the SMS verification popup is done separately, on the Fraud Protection page under Modal content.
Added custom fields? Their labels live under the Custom fields sub-tab, not with the standard fields.
Place a test order in each language you sell in, so you see the error messages as well as the labels.
Stuck on any of this? Open the chat in the bottom right corner of the app and we will help you set it up.