fix(examples): translate leftover Spanish to English in gallery code

- examples-robot-desktop: Serial messages, comments and identifiers
  (right/left servos, light threshold naming, START state) across the
  embedded .ino and headers
- examples-100-days: PULL_DOWN explainer comment in the MicroPython menu day

frontend/src/data/examples-100-days.ts

@@ -1969,11 +1969,11 @@ CITY = "city"
 i2c = I2C(0, scl=Pin(22), sda=Pin(21))
 oled = ssd1306.SSD1306_I2C(128, 64, i2c)
 
-# PULL_DOWN, no Pin.IN a secas: los botones van entre 3V3 y el pin, asi que sin
-# pull-down el pin queda FLOTANDO cuando el boton esta abierto y pin.value() no
-# vale nada. En una placa de verdad se lee ruido; aqui el nodo resuelve a 3,3 V y
-# los dos botones parecen pulsados para siempre, con wait_for_release() girando
-# en vacio. Es el mismo fallo que en hardware, no un artefacto del emulador.
+# PULL_DOWN, not plain Pin.IN: the buttons sit between 3V3 and the pin, so
+# without a pull-down the pin FLOATS while the button is open and pin.value()
+# is meaningless. On a real board you read noise; here the node resolves to
+# 3.3 V and both buttons look pressed forever, with wait_for_release()
+# spinning on nothing. Same failure as on real hardware, not an emulator artifact.
 touch_next = Pin(14, Pin.IN, Pin.PULL_DOWN)
 touch_sel  = Pin(27, Pin.IN, Pin.PULL_DOWN)