[EN Dimension] 500 MB / mB / mb isn't recognized correctly

[iMicknl]

While working on Dutch NumberWithUnits and creating more tests, I found out that Megabyte / Megabit isn't recognised correctly in all cultures. (and it doesn't have tests in English specs).

{
  "Text": "500 mB",
  "Start": 0,
  "End": 5,
  "TypeName": "dimension",
  "Resolution": {
    "value": null
  }
}

{
  "Text": "500 kB",
  "Start": 0,
  "End": 5,
  "TypeName": "dimension",
  "Resolution": {
    "unit": "Kilobit",
    "value": "500"
  }
}

[iMicknl]

@tellarin @STayinloves could this maybe be reopened? I just checked it and Megabit is indeed working now, however Megabyte isn't recognized.

Input: 500 mB, output should be 500 Megabyte according to the defined Pattern

{
  "Text": "500 mB",
  "Start": 0,
  "End": 5,
  "TypeName": "dimension",
  "Resolution": {
    "unit": "Megabit",
    "value": "500"
  }
}

Megabyte: -megabyte|-megabytes|megabyte|mB|megabytes|mega byte|mega bytes|MByte

Also, the symbol for Megabyte is MB and not mB. Should I do a PR to change this or is this something that could be fixed while fixing this issue?

[tellarin]

@iMicknl thanks for the catch. Should be covered now.