This process is described in the following video:

Install the I2 Localization package

Select the global Language Source at Assets \ I2 \ Localization \ I2Languages.prefab

Add the Languages

…And the phrases you need

Select the objects you want to change depending on the language.

Add a I2 \ Localization \ Localize component to them.

Then select the term you already created in the Language Source.

Objects valid for localization include:

Labels, Fonts, Textures, AudioClips, GameObjects, Sprites, Atlases, among others depending on the plugins you have installed.

To allow changing languages, add an I2 \ Localization \ SetLanguage component to your  buttons.

Select the language from the dropdown

Assign the ApplyLanguage function to the OnClick event

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