Twenty Twenty-Five: Update text strings

[carolinan]

In Twenty Twenty-Five:

• Remove the unnecessary context from some text strings where the translatable text was the same but the context was different. This reduces the number of strings a translator needs to work with.
• Use straight double quotes and straight apostrophes, to follow the documentation standards.
• Update the name of headers, to make it easier for translators to understand that they are site headers not headings.
• Update the name of templates to make the naming more consistent. Example:
  Title: Text-only blog, home is now Title: Text blog home to match Title: News blog home etc.

Trac ticket: https://core.trac.wordpress.org/ticket/62482

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[sabernhardt]

Using 'Learn More' in the banner-intro-image and hero-full-width-image patterns would make them consistent with each other, but the existing string in cta-centered-heading has a lowercase m:

wordpress-develop/src/wp-content/themes/twentytwentyfive/patterns/cta-centered-heading.php

Line 28 in 626d9af

<div class="wp-block-button"><a class="wp-block-button__link wp-element-button"><?php esc_html_e( 'Learn more', 'twentytwentyfive' ); ?></a></div>