Add YEC 2022 slogan strings to torbutton and fenix
Here's the spec from the YEC comittee: tpo/applications/tor-browser#41303 (comment 2836454)
The needed strings:
| NAME | en-US | Note |
|---|---|---|
| yec2022.powered_by_privacy | "POWERED BY PRIVACY:" | |
| yec2022.resistance | "RESISTANCE" | |
| yec2022.change | "CHANGE" | |
| yec2022.freedom | "FREEDOM" | |
| yec2022.donate_now | "DONATE NOW" | |
| yec2022.donation_matching | "Your donation will be matched by Friends of Tor, up to $150,000." | monetary amount is USD; "Friends of Tor" is a specific group/organization |