[Tagging] More human readable values for traffic signs

[Bryce Nesbitt]

How about

traffic_sign:transcription=__________________

For a copy, in the local language, of the text on the sign.  This is what a
GPS might speak to you
(or, if blind people drove cars, what you'd say to them):

traffic_sign=no_parking
traffic_sign:transcription=No truck parking 8am-9am on school days. 10
minute limit at all other times.
traffic_sign:scope=regulatory

traffic_sign:transcription=Curve Left 20 mph
traffic_sign:scope=advisory

traffic_sign:transcription=STOP
traffic_sign:scope=regulatory

traffic_sign:transcription=Speed limit 25mph unless otherwise posted.
traffic_sign:scope=regulatory
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