Fix typo in i18n documentation (#632)

docs/api/i18n.md

@@ -17,7 +17,7 @@ See [i18n extra](/docs/extras/i18n.md) if you need to use the slower standard `i
 
 Pagy provides many ready-to-use dictionaries for different locales/languages usable with single or multi languages apps.
 
-All the pagy strings are are stored in the dictionary files of its [locales](https://github.com/ddnexus/pagy/blob/master/lib/locales), ready to be customized and/or used with or without the `I18n` gem. The files follow the same structure of the standard locale files for the `i18n` gem.
+All the pagy strings are stored in the dictionary files of its [locales](https://github.com/ddnexus/pagy/blob/master/lib/locales), ready to be customized and/or used with or without the `I18n` gem. The files follow the same structure of the standard locale files for the `i18n` gem.
 
 !!!success PRs Welcome!
 If you are using pagy with some language missing from the [locales](https://github.com/ddnexus/pagy/blob/master/lib/locales), please, [submit your translation](https://github.com/ddnexus/pagy/pulls)!