Redesign form navigation for ODK-X Survey

[NiranjanNlc]

Pull Request: Improved ODK-X Survey Navigation

This PR solves the Issue of Redesign form navigation for ODK-X Survey

Changes made :

• Updated the color of the button and button text to reflect the ODK-x guidelines .
• Placed the back button and next button in the leftmost and rightmost side and localized title in the middle to ensure the clear readability of the navigation bars.

Rationale:

• Given change reflects the ODK-x design guidelines which helps in the branding of the app.
• Arrangement of button is done in such a way that it ensure clear readability and visibility.

Screenshots:

App Desighner Preview	Mobile Screenshot 1	Mobile Screenshot 2

@wbrunette
Please review this pull request, and any feedback or suggestions are greatly appreciated.
Thank you!

[cvemann]

Your changes are apparent @NiranjanNlc

The ODK-X guidelines mirror the guidelines in Material Design. You can take a look to see how Top App Bars should solve this issue accurately.

Well done!