feat: make UI strings localisable via LOCALE environment variable

Agent-Logs-Url: https://github.com/wasi-master/13ft/sessions/3b6e6061-c4d2-4aa1-879b-8526ccd3b1db

Co-authored-by: wasi-master <63045920+wasi-master@users.noreply.github.com>

app/locales/en.json

@@ -0,0 +1,27 @@
+{
+  "heading": "Enter Website Link",
+  "label": "Link of the website you want to remove paywall for:",
+  "submit": "Submit",
+  "toggle_dark_mode": "Toggle Dark Mode",
+  "status_heading": "Fetching Article",
+  "error_title": "Something went wrong",
+  "retry_button": "Try Another URL",
+  "elapsed_template": "{seconds}s elapsed",
+  "connection_lost_error": "Connection to server lost. The page may be taking too long to load.",
+  "step_connect": "Connecting to website...",
+  "step_fetch": "Downloading page content...",
+  "step_detect": "Checking for anti-bot challenges...",
+  "step_fallback_freedium": "Trying Freedium (Medium bypass)...",
+  "step_fallback_org": "Trying archive.org snapshot...",
+  "step_fallback_ph": "Trying archive.today / archive.ph snapshot...",
+  "step_process": "Processing article...",
+  "step_cleanup": "Cleaning up & preparing view...",
+  "step_done": "Done!",
+  "invalid_url": "Invalid URL",
+  "medium_challenge_error": "Medium served an anti-bot challenge and Freedium / archive.org / archive.today all came back empty. The article may be too new to have been archived yet.",
+  "challenge_error": "The site served an anti-bot challenge (Cloudflare or similar) and no usable snapshot was found on archive.org or archive.today. This site is actively blocking automated requests.",
+  "timeout_error": "The website took too long to respond (30s timeout). Try again later.",
+  "connection_error": "Could not connect to the website. Check the URL and try again.",
+  "request_error": "Failed to fetch the page: {error}",
+  "unexpected_error": "Unexpected error: {error}"
+}