[openstreetmap/openstreetmap-website] Fixed the grammatical mistake mentioned in Issue #5772 (PR #5784)

[Ngoc Phuc Khang Nguyen]

### Description
This Pull Request is to tackle the grammatical mistake mentioned in Issue #5772. In particular, the use of "sign-in" as a noun in this context is incorrect, as it is inconsistent with the other verbs within the permission list.

**Fix:** "Sign-in" has been changed to "sign in" (without the hyphen).

Required citations, credited to @maro-21 in the comment of the original issue, are as follows:

- https://www.oxfordlearnersdictionaries.com/definition/english/sign-in?q=sign-in
- https://en.wiktionary.org/wiki/sign-in
- https://www.dictionary.com/browse/sign-in
- https://www.oed.com/dictionary/sign-in_adj?tl=true

### How has this been tested?
<!--Explain the steps you took to test your code.-->
Since this is a grammatical fix for a text, testing is not required.

You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/5784

-- Commit Summary --

  * Fixed the grammatical mistake mentioned in Issue #5772

-- File Changes --

    M config/locales/en.yml (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/5784.patch
https://github.com/openstreetmap/openstreetmap-website/pull/5784.diff

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