Polish KarlDNS production UI and docs

scripts/install-linux.sh

@@ -22,12 +22,12 @@ Usage:
 
 Options:
   --base-url URL       KarlDNS server URL. Default: https://karldns.de
-  --raw-base-url URL   Script download base URL. Default: GitHub raw main branch
-  --every MINUTES      Cron interval, 1-60. Default: 5
+  --raw-base-url URL   Updater script download URL
+  --every MINUTES      Update interval, 1-60. Default: 5
   --mode MODE          auto, system, or user. Default: auto
-  --update-url URL     Existing private /u/<secret> update URL
-  --hostname NAME      Optional display hostname for output/config
-  --dashboard-url URL  Optional private dashboard URL for output/config
+  --update-url URL     Existing private update URL
+  --hostname NAME      Hostname to show after install
+  --dashboard-url URL  Private dashboard URL to show after install
   --ipv4 VALUE         auto, off, or a static IPv4. Default: auto
   --ipv6 VALUE         auto, off, or a static IPv6. Default: auto
   --no-cron            Install files only, do not configure cron
@@ -202,7 +202,7 @@ case "$KARLDNS_INSTALL_MODE" in
 esac
 
 if [ "$KARLDNS_INSTALL_MODE" = "system" ] && [ "$(id -u)" -ne 0 ]; then
-  echo "System install needs root. Re-run with sudo or set KARLDNS_INSTALL_MODE=user." >&2
+  echo "System install needs root. Re-run with sudo or use --mode user." >&2
   exit 1
 fi
 
@@ -215,7 +215,7 @@ if [ -z "$KARLDNS_UPDATE_URL" ]; then
 fi
 
 if [ -z "$KARLDNS_UPDATE_URL" ]; then
-  echo "KarlDNS installer: could not get an update URL" >&2
+  echo "KarlDNS installer: could not create an update URL" >&2
   exit 1
 fi
 case "$KARLDNS_UPDATE_URL" in
@@ -230,10 +230,10 @@ fi
 
 echo "KarlDNS installed."
 echo "Hostname: ${KARLDNS_HOSTNAME:-already configured}"
-echo "Dashboard: ${KARLDNS_MANAGEMENT_URL:-use your existing private status page}"
+echo "Dashboard: ${KARLDNS_MANAGEMENT_URL:-use your existing private dashboard}"
 echo "Mode: $KARLDNS_INSTALL_MODE"
 if [ "$KARLDNS_SKIP_CRON" = "0" ]; then
-  echo "Interval: every $KARLDNS_INTERVAL_MINUTES minute(s)"
+  echo "Interval: every $KARLDNS_INTERVAL_MINUTES minutes"
 else
   echo "Cron: skipped"
 fi