fix: correct spelling errors in UI text

[Vishal27alpha]

Linked issue

• Closes #
• Related #

Existing related work reviewed

• Issues/PRs reviewed: None found after search

Overlap assessment

• Classification: none
• Overlapping items: None
• Why this is not duplicate/superseded:
  This PR fixes minor spelling mistakes in UI text and does not overlap with any existing work.

Why this PR should proceed

• Improves UI text clarity and professionalism
• No functional changes involved
• Small, isolated fix

Summary

• What changed:
  Fixed spelling mistakes in UI text in AddCase.js and DataFile.js

• Why:
  To improve readability and correctness of user-facing text

Validation

• Tests added/updated (or not applicable)
• Validation steps documented
• Evidence attached (logs/screenshots/output as relevant)

Documentation

• Docs updated in this PR (or not applicable)
• Any setup/workflow changes reflected in repo docs

Scope check

• No unrelated refactors
• Implemented from a feature branch
• Change is deliverable without upstream OSeMOSYS/MUIO dependency
• Base repo/branch is EAPD-DRB/MUIOGO:main (not upstream)

Exception rationale

This PR qualifies for the narrow docs/typo exception as it only fixes minor spelling mistakes in UI text and does not introduce any functional changes.

[Copilot]

Pull request overview

This PR aims to improve user-facing UI text clarity by correcting spelling mistakes in controller messages within the WebAPP.

Changes:

• Fixed “Plese wait...” to “Please wait...” in batch run / cleanup loader messages.
• Corrected multiple typos in AddCase UI warnings/dialogs (e.g., “neccessary” → “necessary”, “visalisation” → “visualisation”).
• Updated a scenario deletion alert message text.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
WebAPP/App/Controller/DataFile.js	Corrects spelling in loader messages shown during batch run and cleanup actions.
WebAPP/App/Controller/AddCase.js	Corrects several typos in warnings/dialogs, but introduces/retains a couple of user-facing wording issues that should be fixed.

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