Format a presentation for another language in Keynote on iPhone
A presentation’s language and region determine the formatting conventions of the text — for example, whether commas or periods are used as decimal points, which currency symbol is used, where to hyphenate words at line breaks and how dates are presented (day/month/year or month/day/year).
You can create a presentation that uses the formatting of a different language as long as you have more than one language in your device’s preferred language list. To use another language in your presentation, you need to add an input source for that language (for example a second keyboard), in Settings 
.
Tip: In iOS 15 or later, you can translate text in your presentation to another language, then choose if you want to copy the translation, replace the text with the translation and more. Select the text you want to translate, then tap Translate. To learn more about the Translate feature, see the iPhone User Guide.
Set up a keyboard or other input source for another language
To use another language in your presentation, first set up an input source (for example a language-specific keyboard or character palette), for the language. When you add a language-specific keyboard to your device that language is also added to your device’s preferred language list.
On the Home screen, tap Settings, then tap General.
Tap Keyboard > Keyboards > Add New Keyboard, then tap the keyboard you want to use.
To learn about using different languages and keyboards, see the user guide for your device.
If Keynote is open, quit Keynote and reopen it so that it recognises the source.
To switch to the other input source, press and hold
at the bottom of the keyboard, then choose the one you want.
If you switch to a language written in a direction different from the current language, the insertion point moves to the side of the slide used by the new language. For example, if you switch the input source from English to Hebrew, the insertion point moves to the right side of the slide.
Create a presentation with the formatting of a different language
When you create a new presentation, you can automatically format numbers, dates, times and currency in tables and graphs using the formatting conventions of a specific language and region. You might want to do this if you plan to share the presentation with someone in another region.
For example, some regions use commas instead of full stops to indicate decimal points, or they use different monetary symbols for currency, or they display text from right to left instead of left to right.
This language setting affects only the current presentation.
Go to the Keynote app
on your iPhone.With the document manager in browse view, tap Choose a Theme.
Tap
in the top-right corner of the theme chooser, then choose another language (you may need to tap the current language to see other languages).Tap Settings in the top-left corner of the language menu, tap Done, then tap the theme you want to use.
When you choose a new language, the theme titles and text and some of the formatting controls change to reflect that language.
When you view a presentation that uses a language and formatting different from your device’s, a message near the bottom of the presentation indicates which formatting is used. To see examples of the formatting differences, tap the language in the message.
Note: Spelling is checked according to the language of the keyboard you’re using, not the language of the presentation.
Change a presentation’s language and formatting
After you create a presentation, you can change its language setting while the presentation is open.
Note: You can’t change this setting for a shared presentation.
Tap
, tap Presentation Options, then tap Language & Region.You may need to swipe up in the controls to see Language and Region.
Tap Language and select a new language.
If you choose the first item in the Language pop-up menu (System - [language]), you reset the presentation to the language and region of your device. If you subsequently change your device’s language setting or if you open the presentation on a device with a different language setting, the presentation’s language and region automatically change to match the device’s. But if you share the presentation, all users see the presentation in the language and region of your device.
Tap Region (if it’s active) and select a region.
Tap Done.
After you change the presentation’s language and region, any new table and graph data you enter matches the new language. For existing table and graph data, the language in dates (for example, month names) changes, but the punctuation in dates and the order of the day, month and year don’t change. The punctuation in numbers (for example, the decimal point and thousands separator), does change.