Dashboard: Do not use capitalized strings for internationalization

[swissspidy]

Bug Description

In the TemplateNavBar the string Use template is written in all caps:

https://github.com/google/web-stories-wp/blob/c3323311aa68c70944f53d8a651035c61ab9a829/assets/src/dashboard/components/templateNavBar/index.js#L87-L89

This is not ideal for translators, especially since the string Use template already exists a few times. So this would duplicate strings.

Expected Behaviour

Use template should be written like so, and capitalized with CSS (text-transform: uppercase).

Steps to Reproduce

Check out a template on the dashboard.

Screenshots

Additional Context

• Plugin Version: master
• Operating System:
• Browser:

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Acceptance Criteria

Implementation Brief

[BrittanyIRL]

Fixed w/ other small text bug: #2293