some screen descriptions are confusing in mileage app

[ysong10]

Observed behavior: some screens' descriptions are confusing.

S2R:

1. for the OB I input: the app crashed when I add a new vehicle.
2. then I get those OB screenshots below.

[bee-tool]

Quality assessment:

- The system's expected behavior (EB) might not have been provided!

@ysong10 Can you provide this information in the bug report?

[bee-tool]

Title: some screen descriptions are confusing in mileage app

Description:

Observed behavior: some screens' descriptions are confusing.

S2R:

1. for the OB I input: the app crashed when I add a new vehicle,
2. then I get those OB screenshots below