Refresh: Home - add final copy & code strings for L10n

[stephaniehobson]

Strings are pretty final and we're ready to send them to L10n for translation. Any changes after this point will need to be versioned. Please add all strings to Fluent and reference the fluent IDs in the templates.

This is the copy doc.

A few notes:

• include spaces around any em dashes foo — bar not foo—bar (Both Rob and Mary have confirmed this, ignore what's in the copy doc). (This only applies to em dashes, not en dashes.)
• CTAs should be sentence case
• Use curly quotes “”‘’
• please update links and data-cta-text values as you work.
• we were asked to drop the CTAs from the last sections on both pages (Home/issues, About/community) you can leave those out.

[stephaniehobson]

Just waiting for alt text strings to finalize.