Added Swahili (sw) language support

[shalini-saloni]

Description

This PR adds Swahili (Kiswahili) language support to DrawDB, expanding accessibility to Swahili-speaking users across East Africa and beyond.

Changes Made

New Files

• src/i18n/locales/sw.js: Complete Swahili locale file
  • All 284+ translation keys translated to Swahili
  • Language metadata: { name: "Swahili", native_name: "Kiswahili", code: "sw" }
  • Follows existing locale file structure

Modified Files

• src/i18n/i18n.js: Updated i18n configuration
  • Added Swahili import statement
  • Added swahili to the languages array
  • Registered sw in i18n resources

Testing Performed

Functionality Testing

• Swahili appears in the language selector
• Language switching works correctly
• UI elements display Swahili translations
• Language preference persists across browser sessions

Integration Testing

• All existing languages continue to work
• No breaking changes to existing functionality
• Language list remains alphabetically sorted

Related Issues

Closes #805

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