docs: fix gramatical typos in README (#4222)

* Remove stray word in README

* Add missing word in README

README.md

@@ -93,15 +93,15 @@ The [axe-core API](doc/API.md) package consists of:
 
 ## Localization
 
-Axe can be built using your local language. To do so, a localization file must be added to the `./locales` directory. This file must have be named in the following manner: `<langcode>.json`. To build axe using this locale, instead of the default, run axe with the `--lang` flag, like so:
+Axe can be built using your local language. To do so, a localization file must be added to the `./locales` directory. This file must be named in the following manner: `<langcode>.json`. To build axe using this locale, instead of the default, run axe with the `--lang` flag, like so:
 
 `grunt build --lang=nl`
 
 or equivalently:
 
 `npm run build -- --lang=nl`
 
-This will create a new build for axe, called `axe.<lang>.js` and `axe.<lang>.min.js`. If you want to build localized versions, simply pass in `--all-lang` instead. If you want to build multiple localized versions (but not all of them), you can pass in a comma-separated list of languages to the `--lang` flag, like `--lang=nl,ja`.
+This will create a new build for axe, called `axe.<lang>.js` and `axe.<lang>.min.js`. If you want to build all localized versions, simply pass in `--all-lang` instead. If you want to build multiple localized versions (but not all of them), you can pass in a comma-separated list of languages to the `--lang` flag, like `--lang=nl,ja`.
 
 To create a new translation for axe, start by running `grunt translate --lang=<langcode>`. This will create a json file fin the `./locales` directory, with the default English text in it for you to translate. Alternatively, you could copy `./locales/_template.json`. We welcome any localization for axe-core. For details on how to contribute, see the Contributing section below. For details on the message syntax, see [Check Message Template](/docs/check-message-template.md).