Extract hardcoded homepage strings to locale files for better translation support

[ablzh]

Currently, several strings on the homepage are hardcoded in English in the templates. This prevents the homepage from being fully localized for non-English-speaking users.

Specific examples:

• The "A Programmer's Best Friend" slogan in the "Hero" section and meta tags.
• The "Try!" button text.
• The "Try Ruby" link text at the bottom of the section.

Proposed Solution

I propose moving these hardcoded strings to the _data/locales/home/ structure, as is done for other page components.

If this is a suitable solution, I can submit a PR.