Add support for multiple pipes in placeholder modifiers

[Copilot]

• Explore codebase structure and understand current implementation
• Modify PlaceholderFormatter regex to support multiple pipes separated by |
• Update processPlaceholder to split pipes and apply them sequentially
• Create comprehensive tests for multiple pipes functionality
• Test escaped pipes (\|) are treated as arguments not separators
• Add documentation for the new feature
• Verify implementation with manual integration tests
• Run code review (1 comment - verified regex pattern is correct)
• Run security checks (passed - no issues detected)
• Update docs/modifiers/Modifiers.md with multiple pipes documentation

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add support for multiple pipes in placeholder modifiers</issue_title>
<issue_description>At the moment, we can only have 1 pipe modifying the value of a placeholder (e.g. {{placeholder|trans}}). But we could enable support for adding multiple pipes to a placeholder.

{{placeholder|trans|quote}}

It will probably not be possible to combine all placeholders, but it's interesting feature for us to have. If we consider the possibility of #8, we should make sure that we can still use | as an argument of a modifier, as long as it's escaped (\|),</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add support for multiple pipes in placeholder modifiers #9

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[henriquemoody]

Great changes!

Now make sure docs/modifiers/Modifiers.md is up-to-date as well

[Copilot]

Great changes!

Now make sure docs/modifiers/Modifiers.md is up-to-date as well

Updated! Added a "Chaining Multiple Modifiers" section to docs/modifiers/Modifiers.md with examples and explanation of the sequential application behavior. (d8fb54c)