Add spellchecker

.github/actions/spelling/README.md

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+# check-spelling/check-spelling configuration
+
+File | Purpose | Format | Info
+-|-|-|-
+[dictionary.txt](dictionary.txt) | Replacement dictionary (creating this file will override the default dictionary) | one word per line | [dictionary](https://github.com/check-spelling/check-spelling/wiki/Configuration#dictionary)
+[allow.txt](allow.txt) | Add words to the dictionary | one word per line (only letters and `'`s allowed) | [allow](https://github.com/check-spelling/check-spelling/wiki/Configuration#allow)
+[reject.txt](reject.txt) | Remove words from the dictionary (after allow) | grep pattern matching whole dictionary words | [reject](https://github.com/check-spelling/check-spelling/wiki/Configuration-Examples%3A-reject)
+[excludes.txt](excludes.txt) | Files to ignore entirely | perl regular expression | [excludes](https://github.com/check-spelling/check-spelling/wiki/Configuration-Examples%3A-excludes)
+[only.txt](only.txt) | Only check matching files (applied after excludes) | perl regular expression | [only](https://github.com/check-spelling/check-spelling/wiki/Configuration-Examples%3A-only)
+[patterns.txt](patterns.txt) | Patterns to ignore from checked lines | perl regular expression (order matters, first match wins) | [patterns](https://github.com/check-spelling/check-spelling/wiki/Configuration-Examples%3A-patterns)
+[candidate.patterns](candidate.patterns) | Patterns that might be worth adding to [patterns.txt](patterns.txt) | perl regular expression with optional comment block introductions (all matches will be suggested) | [candidates](https://github.com/check-spelling/check-spelling/wiki/Feature:-Suggest-patterns)
+[line_forbidden.patterns](line_forbidden.patterns) | Patterns to flag in checked lines | perl regular expression (order matters, first match wins) | [patterns](https://github.com/check-spelling/check-spelling/wiki/Configuration-Examples%3A-patterns)
+[expect.txt](expect.txt) | Expected words that aren't in the dictionary | one word per line (sorted, alphabetically) | [expect](https://github.com/check-spelling/check-spelling/wiki/Configuration#expect)
+[advice.md](advice.md) | Supplement for GitHub comment when unrecognized words are found | GitHub Markdown | [advice](https://github.com/check-spelling/check-spelling/wiki/Configuration-Examples%3A-advice)
+[block-delimiters.list](block-delimiters.list) | Define block begin/end markers to ignore lines of text | line with _literal string_ for **start** followed by line with _literal string_ for **end** | [block ignore](https://github.com/check-spelling/check-spelling/wiki/Feature%3A-Block-Ignore#status)
+
+Note: you can replace any of these files with a directory by the same name (minus the suffix)
+and then include multiple files inside that directory (with that suffix) to merge multiple files together.

.github/actions/spelling/advice.md

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+<!-- See https://github.com/check-spelling/check-spelling/wiki/Configuration-Examples%3A-advice --> <!-- markdownlint-disable MD033 MD041 -->
+<details><summary>If the flagged items are :exploding_head: false positives</summary>
+
+If items relate to a ...
+* binary file (or some other file you wouldn't want to check at all).
+
+  Please add a file path to the `excludes.txt` file matching the containing file.
+
+  File paths are Perl 5 Regular Expressions - you can [test](
+https://www.regexplanet.com/advanced/perl/) yours before committing to verify it will match your files.
+
+  `^` refers to the file's path from the root of the repository, so `^README\.md$` would exclude [README.md](
+../tree/HEAD/README.md) (on whichever branch you're using).
+
+* well-formed pattern.
+
+  If you can write a [pattern](
+https://github.com/check-spelling/check-spelling/wiki/Configuration-Examples:-patterns
+) that would match it,
+  try adding it to the `patterns.txt` file.
+
+  Patterns are Perl 5 Regular Expressions - you can [test](
+https://www.regexplanet.com/advanced/perl/) yours before committing to verify it will match your lines.
+
+  Note that patterns can't match multiline strings.
+
+</details>
+
+<!-- adoption information-->
+:steam_locomotive: If you're seeing this message and your PR is from a branch that doesn't have check-spelling,
+please merge to your PR's base branch to get the version configured for your repository.

.github/workflows/spelling.yml

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+name: Check Spelling
+
+# Comment management is handled through a secondary job, for details see:
+# https://github.com/check-spelling/check-spelling/wiki/Feature%3A-Restricted-Permissions
+#
+# `jobs.comment-push` runs when a push is made to a repository and the `jobs.spelling` job needs to make a comment
+#   (in odd cases, it might actually run just to collapse a comment, but that's fairly rare)
+#   it needs `contents: write` in order to add a comment.
+#
+# `jobs.comment-pr` runs when a pull_request is made to a repository and the `jobs.spelling` job needs to make a comment
+#   or collapse a comment (in the case where it had previously made a comment and now no longer needs to show a comment)
+#   it needs `pull-requests: write` in order to manipulate those comments.
+
+# Updating pull request branches is managed via comment handling.
+# For details, see: https://github.com/check-spelling/check-spelling/wiki/Feature:-Update-expect-list
+#
+# These elements work together to make it happen:
+#
+# `on.issue_comment`
+#   This event listens to comments by users asking to update the metadata.
+#
+# `jobs.update`
+#   This job runs in response to an issue_comment and will push a new commit
+#   to update the spelling metadata.
+#
+# `with.experimental_apply_changes_via_bot`
+#   Tells the action to support and generate messages that enable it
+#   to make a commit to update the spelling metadata.
+#
+# `with.ssh_key`
+#   In order to trigger workflows when the commit is made, you can provide a
+#   secret (typically, a write-enabled github deploy key).
+#
+#   For background, see: https://github.com/check-spelling/check-spelling/wiki/Feature:-Update-with-deploy-key
+
+# Sarif reporting
+#
+# Access to Sarif reports is generally restricted (by GitHub) to members of the repository.
+#
+# Requires enabling `security-events: write`
+# and configuring the action with `use_sarif: 1`
+#
+#   For information on the feature, see: https://github.com/check-spelling/check-spelling/wiki/Feature:-Sarif-output
+
+# Minimal workflow structure:
+#
+# on:
+#   push:
+#     ...
+#   pull_request_target:
+#     ...
+# jobs:
+#   # you only want the spelling job, all others should be omitted
+#   spelling:
+#     # remove `security-events: write` and `use_sarif: 1`
+#     # remove `experimental_apply_changes_via_bot: 1`
+#     ... otherwise adjust the `with:` as you wish
+
+on:
+  push:
+    branches:
+    - "**"
+    tags-ignore:
+    - "**"
+  pull_request_target:
+    branches:
+    - "**"
+    types:
+    - 'opened'
+    - 'reopened'
+    - 'synchronize'
+  issue_comment:
+    types:
+    - 'created'
+
+jobs:
+  spelling:
+    name: Check Spelling
+    permissions:
+      contents: read
+      pull-requests: read
+      actions: read
+      security-events: write
+    outputs:
+      followup: ${{ steps.spelling.outputs.followup }}
+    runs-on: ubuntu-latest
+    if: ${{ contains(github.event_name, 'pull_request') || github.event_name == 'push' }}
+    concurrency:
+      group: spelling-${{ github.event.pull_request.number || github.ref }}
+      # note: If you use only_check_changed_files, you do not want cancel-in-progress
+      cancel-in-progress: true
+    steps:
+    - name: check-spelling
+      id: spelling
+      uses: check-spelling/[email protected]
+      with:
+        suppress_push_for_open_pull_request: ${{ github.actor != 'dependabot[bot]' && 1 }}
+        checkout: true
+        check_file_names: 1
+        spell_check_this: check-spelling/spell-check-this@prerelease
+        post_comment: 0
+        use_magic_file: 1
+        report-timing: 1
+        warnings: bad-regex,binary-file,deprecated-feature,ignored-expect-variant,large-file,limited-references,no-newline-at-eof,noisy-file,non-alpha-in-dictionary,token-is-substring,unexpected-line-ending,whitespace-in-dictionary,minified-file,unsupported-configuration,no-files-to-check
+        experimental_apply_changes_via_bot: ${{ github.repository_owner != 'decidim' && 1 }}
+        use_sarif: ${{ (!github.event.pull_request || (github.event.pull_request.head.repo.full_name == github.repository)) && 1 }}
+        check_extra_dictionaries: ''
+        extra_dictionaries:
+          cspell:software-terms/dict/softwareTerms.txt
+          cspell:lorem-ipsum/dictionary.txt
+          cspell:fullstack/dict/fullstack.txt
+          cspell:typescript/dict/typescript.txt
+          cspell:aws/aws.txt
+          cspell:php/dict/php.txt
+          cspell:python/src/python/python-lib.txt
+          cspell:html/dict/html.txt
+          cspell:ruby/dict/ruby.txt
+          cspell:filetypes/filetypes.txt
+          cspell:java/src/java.txt
+          cspell:node/dict/node.txt
+          cspell:npm/dict/npm.txt
+          cspell:css/dict/css.txt
+          cspell:shell/dict/shell-all-words.txt
+          cspell:k8s/dict/k8s.txt
+          cspell:python/src/common/extra.txt
+          cspell:dotnet/dict/dotnet.txt
+
+  update:
+    name: Update PR
+    permissions:
+      contents: write
+      pull-requests: write
+      actions: read
+    runs-on: ubuntu-latest
+    if: ${{
+        github.repository_owner != 'decidim' &&
+        github.event_name == 'issue_comment' &&
+        github.event.issue.pull_request &&
+        contains(github.event.comment.body, '@check-spelling-bot apply')
+      }}
+    concurrency:
+      group: spelling-update-${{ github.event.issue.number }}
+      cancel-in-progress: false
+    steps:
+    - name: apply spelling updates
+      uses: check-spelling/[email protected]
+      with:
+        experimental_apply_changes_via_bot: 1
+        checkout: true
+        ssh_key: "${{ secrets.CHECK_SPELLING }}"