A way down the tree from every page

An arrow fixed at the left edge, half-way up the screen, and the same
link in words at the foot of the page. It goes one level down: the
nearest page below the current path that the visitor may open, found by
taking the path apart a segment at a time, and the front door when none
of those is a page (/status/oppslag -> /, /review/abc -> /review). The
front door itself has none. Labelled with where it goes: 'Tilbake til
starten', or the target page's question in quotation marks.

Content stops needing a 'back' alternative on every page, and a visitor
who went up a branch whose context did not apply is never stranded.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GT37Z1Xtfd9pUuQtMTg6Yt

src/i18n.rs

@@ -33,6 +33,8 @@ fn lookup(lang: &str, key: &str) -> Option<&'static str> {
             "This part of the site is for organizational owners — sign in with that account to take a look."
         }
         ("en", "announcements") => "Announcements",
+        ("en", "down_to") => "Back to ",
+        ("en", "the_start") => "the start",
 
         ("no", "also_worth_asking") => "Også verdt å spørre",
         ("no", "asked_by") => "Stilt av ",
@@ -51,6 +53,8 @@ fn lookup(lang: &str, key: &str) -> Option<&'static str> {
             "Denne delen av siden er for organisasjonens eiere — logg inn med den kontoen for å ta en titt."
         }
         ("no", "announcements") => "Kunngjøringer",
+        ("no", "down_to") => "Tilbake til ",
+        ("no", "the_start") => "starten",
 
         _ => return None,
     })
@@ -83,6 +87,8 @@ mod tests {
             "follows_answer",
             "owners_only",
             "announcements",
+            "down_to",
+            "the_start",
         ] {
             assert!(lookup("en", key).is_some(), "en missing {key}");
             assert!(lookup("no", key).is_some(), "no missing {key}");