gui, man, authors: Update docs, translations, and contributors

gui/default/assets/lang/lang-en.json

@@ -292,6 +292,7 @@
    "Syncthing seems to be down, or there is a problem with your Internet connection. Retrying…": "Syncthing seems to be down, or there is a problem with your Internet connection. Retrying…",
    "Syncthing seems to be experiencing a problem processing your request. Please refresh the page or restart Syncthing if the problem persists.": "Syncthing seems to be experiencing a problem processing your request. Please refresh the page or restart Syncthing if the problem persists.",
    "Take me back": "Take me back",
+   "The GUI address is overridden by startup options. Changes here will not take effect while the override is in place.": "The GUI address is overridden by startup options. Changes here will not take effect while the override is in place.",
    "The Syncthing admin interface is configured to allow remote access without a password.": "The Syncthing admin interface is configured to allow remote access without a password.",
    "The aggregated statistics are publicly available at the URL below.": "The aggregated statistics are publicly available at the URL below.",
    "The configuration has been saved but not activated. Syncthing must restart to activate the new configuration.": "The configuration has been saved but not activated. Syncthing must restart to activate the new configuration.",