Copy updates on Shareform implemented

[flbarfield]

Description

Make updates to share list form on manage list to be more user friendly and descriptive.

Todo:

• [ ] Add label to form, e.g "Share list with another user". consider how to make this more clear. what does 'other user' mean? Right now copy says "existing user" which can be confusing.
• [ ] Make input label copy more clear
• [ ] Update button copy

Related Issue

closes #54

Acceptance Criteria

Copy change requirements met. Tests pass.

Type of Changes

Enhancement

Updates

Before

After

Testing Steps / QA Criteria

Navigate to list view after selecting a list.

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit bae60c1):

https://tcl-67-smart-shopping-list--pr78-improve-share-list-f-nylywld9.web.app

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