Use index macro instead of e

delay() is milliseconds

Add missing Spanish language definitions.

Added tarnslation for
```
#define MSG_DEBUG_MENU 
#define MSG_PROGRESS_BAR_TEST
```

I have been a bit too radical in cleaning up this section.

・Add new translation

- Japanese and Chinese still need update

This can already be done via G-Code, so adding the capability to the LCD should be straight forward.

millis_t is long - divisions take for ever.

Return a kind of millisecond instead of microsecond -
divided by 1024 instead of 1000 for speed. (2.4% error)

That does not matter because block_buffer_runtime is
already a too short estimation.
Shrink the return-type.

Fix size for writeData and readData.
For bilinear grid 11 x 11 for example, size is 4 (float) x 11 x 11 = 484. uint8_t max is 255.