Clearer info on customizing i18n strings (#1345)

* Clearer info on customizing i18n strings

Made this info clearer as I'd actually forgotten you could do this until #1331

* Implementing deining's suggestions

userguide/content/en/docs/Language/_index.md

@@ -98,10 +98,14 @@ If you configure more than one language in `config.toml`, the Docsy theme adds a
 
 ## Internationalization bundles
 
-All UI strings (text for buttons etc.) are bundled inside `/i18n` in the theme, with a `.toml` file for each language.
+All UI strings (text for buttons, repository links, etc.) are bundled inside `/i18n` in the theme, with a `.toml` file for each language.
 
-If your chosen language isn't currently in the theme and you create your own `.toml` file for all the common UI strings (for example, if you translate the UI text into Japanese and create a copy of `en.toml` called `jp.toml`), we recommend you do this **in the theme** rather than in your own project, so it can be reused by others. Any additional strings or overridden values can be added to your project's `/i18n` folder.
+If your chosen language isn't currently in the theme and you create your own `.toml` file for all the common UI strings (for example, if you translate the UI text into Esperanto and create a copy of `en.toml` called `eo.toml`), we recommend you do this **in the theme** rather than in your own project. You can then open a [pull request](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/creating-a-pull-request) to contribute your translation to the Docsy community.
 
 {{% alert title="Hugo Tip" %}}
 Run `hugo server --printI18nWarnings` when doing translation work, as it will give you warnings on what strings are missing.
 {{% /alert %}}
+
+### Create custom UI strings
+
+If any of the Docsy theme UI strings in your chosen language aren't suitable for your project, or if you need additional strings for your site, you can create your own project-specific internationalization file in your project's `/i18n` directory. For example, if you want to override any of Docsy's [English-language strings](https://github.com/google/docsy/blob/main/i18n/en.toml), create your own `/i18n/en.toml` with just your custom strings.  Any values you specify in this file will override the theme versions, while the remaining strings will come from the theme's corresponding internationalization bundle.