v3: localization fixes, char counters & limits on all text fields, ux fixes

public/manifest.webmanifest

@@ -0,0 +1,24 @@
+{
+  "name": "gerbeur",
+  "short_name": "gerbeur",
+  "start_url": "/",
+  "display": "standalone",
+  "background_color": "#111827",
+  "theme_color": "#111827",
+  "icons": [
+    {
+      "src": "/favicon.svg",
+      "type": "image/svg+xml",
+      "sizes": "any"
+    }
+  ],
+  "share_target": {
+    "action": "/",
+    "method": "GET",
+    "params": {
+      "url": "share_url",
+      "title": "share_title",
+      "text": "share_text"
+    }
+  }
+}

public/sw.js

@@ -0,0 +1,2 @@
+self.addEventListener('install', () => self.skipWaiting());
+self.addEventListener('activate', () => self.clients.claim());