Redundant maneuver modifiers in Danish

[1ec5]

Per mapbox/mapbox-navigation-android#1101, some instructions in the Danish localization include redundant directional modifiers:

In Danish, when the voice instructs you to turn left (or right), it says "Drej til venstresving" - literally, "Turn left turn" where it should be "Drej til venstre" (Turn left). Same goes with "Drej til højresving" -> "Drej til højre".

This is evident from our test fixtures:

osrm-text-instructions/test/fixtures/v5/merge/left_default.json

Line 11 in 7a0cef3

"da": "Flet til venstresving",

The affected maneuver types are roundabout_turn, fork, new_name, merge, notification, off ramp (“Take exit 123 on the left turn”), end_of_road, turn, and continue.

Part of the problem is that the generic words for “left”, “sharp left”, etc. have been translated as “left turn”, “sharp left turn”, etc.

osrm-text-instructions/languages/translations/da.json

Lines 30 to 35 in e21d464

	"left": "venstresving",
	"right": "højresving",
	"sharp left": "skarpt venstresving",
	"sharp right": "skarpt højresving",
	"slight left": "svagt venstresving",
	"slight right": "svagt højresving",

Some localizations have done this intentionally because there’s no way to isolate the word “left” but insert it into a sentence after the fact. I’m not sure if this is the case for Danish; we might be able to just simplify the modifier translations. Ideally, common maneuvers would never have to insert the modifier entries. However, we’re currently relying on those entries in a few too many cases: #240.

/cc @danesfeder @cmahopper