docs(presentation): localize slides and fix diagrams

docs/images/websocket-handshake.svg

@@ -3,7 +3,7 @@
   <desc id="desc">A browser and server upgrade an HTTP connection to WebSocket and then exchange frames.</desc>
   <rect width="960" height="540" fill="#f7f9fc"/>
   <text x="72" y="74" fill="#101828" font-family="Inter, Arial, sans-serif" font-size="34" font-weight="700">HTTP Upgrade to WebSocket</text>
-  <text x="72" y="108" fill="#667085" font-family="Inter, Arial, sans-serif" font-size="17">The connection starts as HTTP, then switches protocols after the handshake.</text>
+  <text x="72" y="108" fill="#667085" font-family="Inter, Arial, sans-serif" font-size="16">The connection starts as HTTP, then switches protocols after the handshake.</text>
   <g font-family="Inter, Arial, sans-serif">
     <rect x="86" y="202" width="210" height="126" rx="18" fill="#ffffff" stroke="#d0d5dd"/>
     <text x="139" y="260" fill="#101828" font-size="22" font-weight="700">Browser</text>
@@ -17,7 +17,7 @@
     <text x="376" y="250" fill="#344054" font-size="15" font-weight="700">2. 101 Switching Protocols</text>
     <line x1="310" y1="326" x2="650" y2="326" stroke="#7a5af8" stroke-width="4" stroke-dasharray="10 9" marker-end="url(#arrow-purple)"/>
     <line x1="650" y1="362" x2="310" y2="362" stroke="#7a5af8" stroke-width="4" stroke-dasharray="10 9" marker-end="url(#arrow-purple)"/>
-    <text x="376" y="410" fill="#344054" font-size="15" font-weight="700">3. Full-duplex WebSocket frames over the same TCP connection</text>
+    <text x="342" y="410" fill="#344054" font-size="15" font-weight="700">3. Full-duplex frames over the same TCP connection</text>
   </g>
   <defs>
     <marker id="arrow-blue" markerWidth="12" markerHeight="12" refX="10" refY="6" orient="auto">