Fix incorrect save button locale in user editor

The save button in UserEditorView.axaml was using the
UserProfilesSetProfileImage locale key, which does not
match the intended action of the button.

This resulted in an incorrect or misleading label depending
on the active language.

This MR:

• Replaces the locale binding with UserProfilesSave
• Adds the missing UserProfilesSave entry to Root.json
• Provides translations for all supported languages

The change is limited strictly to localization and does not
affect functionality.

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Reproduction Steps (Before Fix)

1. Open the User Profiles
2. Create User
3. Observe the label of the Save button
4. The text does not correctly reflect the save action