Update main.qml to use the string "Phone Numbers" instead of Dialer because...

Update main.qml to use the string "Phone Numbers" instead of Dialer because dialer relates to older phones and specifically the number pad that phones had. In fact, in English, it relates back to phones with the wheel numbers. I think if instead we say "Phone Numbers" we are implying that we mean phone numbers in the UI will use X program to call with. It seems more relatable and updated imho.