Log level to "debug!" in translate_from_reader (#2221)
Default logger floods the console otherwise:
```
Sep 22 22:41:02.525 INFO translate(181 bytes, u0:1353(i64 vmctx, i64, i32, i32) -> i32 system_v)
Sep 22 22:41:02.526 INFO translate(394 bytes, u0:1354(i64 vmctx, i64, i32) system_v)
Sep 22 22:41:02.527 INFO translate(16307 bytes, u0:944(i64 vmctx, i64, i32, i32, i32) system_v)
Sep 22 22:41:02.528 INFO translate(269 bytes, u0:382(i64 vmctx, i64, i32, i32) system_v)
Sep 22 22:41:02.528 INFO translate(220 bytes, u0:283(i64 vmctx, i64, i32, i32) system_v)
Sep 22 22:41:02.528 INFO translate(603 bytes, u0:383(i64 vmctx, i64, i32, i32) system_v)
Sep 22 22:41:02.528 INFO translate(1470 bytes, u0:284(i64 vmctx, i64, i32, i32) system_v)
Sep 22 22:41:02.529 INFO translate(189 bytes, u0:387(i64 vmctx, i64, i32, i32) -> i32 system_v)
Sep 22 22:41:02.529 INFO translate(14 bytes, u0:388(i64 vmctx, i64, i32, i32) system_v)
```