Fix typo in lib/locales/README.md

[BelaBartok39]

Motivation / Background

My motivation is to get better at best practices by contributing small changes to my favorite teams.

Additional information

Fixed a very small typo in the locales/README.md file. Line 23.

Checklist

Before submitting the PR make sure the following are checked:

• This Pull Request is related to one change. Changes that are unrelated should be opened in separate PRs.
• Commit message has a detailed description of what changed and why. If this PR fixes a related issue include it in the commit message. Ex: [Fix #issue-number]
• Tests are added or updated if you fix a bug, refactor something, or add a feature.
• Tests and Rubocop are passing before submitting your proposed changes.

If you're proposing a new generator:

• Open an issue first for discussion before you write any code.
• Double-check the existing generators documentation to make sure the new generator you want to add doesn't already exist.
• You've reviewed and followed the Documentation guidelines.

[thdaraujo]

Thanks for fixing the typo!
The gemfile changes are unnecessary though.

[BelaBartok39]

Removed Gemfile from accidently including on pull request.

[thdaraujo]

thank you!