Port: Add NormalizationForm and Language to ParatextProjectSettingsParser

[Copilot]

Ports machine.py#313 to C#. Adds NormalizationForm and Language fields parsed from Paratext Settings.xml to ParatextProjectSettings.

Changes

• ParatextProjectSettings — New NormalizationForm and Language constructor parameters and properties
• ParatextProjectSettingsParserBase — Parses <NormalizationForm> (default: "Undefined") and <Language> (default: "") from settings XML
• DefaultParatextProjectSettings (test helper) — Added matching parameters with same defaults
• Tests — Added NormalizationFormDefault test; updated parser test assertions for both new fields

var settings = new FileParatextProjectSettingsParser(projectDir).Parse();
Console.WriteLine(settings.NormalizationForm); // e.g. "NFC"
Console.WriteLine(settings.Language);          // e.g. "English"

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