"Continue onto" --> "Continue to stay on"

[lyzidiamond]

Issue

Closes #41 -- rephrases instruction from "continue onto" to "continue to stay on" when continuing. Note that I added a special condition for exits.

Tasklist

• update language in en.json
• Add changelog entry
• Test with osrm-frontend (?)
• Review by @willwhite and/or @bsudekum and/or @1ec5? (not sure who to tag here)

[mcwhittemore]

This is looking good to me. I'm a bit intrigued to know if we need both to stay on and on from a reducing chattiness pov.

@lyzidiamond - can you write up the changlog and also explain continue.default.exit a bit. I'm not seeing how continue and exiting are the same thing.

[lyzidiamond]

@mcwhittemore Per #41 (comment) + the OSRM docs, "Continue" means "Turn in direction of modifier to stay on the same road." With that in mind, consider these scenarios:

• You are driving on Main Street. In order to stay on Main Street, you need to turn left. Prior to this PR, you would get: "Continue left onto Main Street." But you're already on Main Street. With this PR, you would get: "Continue left to stay on Main Street." It sounds like you're asking if we can drop "to stay", which leaves: "Continue left on Main Street." This sounds confusing to me -- it's ambiguous about whether you're staying on the same street or turning onto a new street.

• The one place this doesn't make sense is when taking a highway exit. Per the tests, going from a ramp onto a road is considered a continue maneuver, but you are actually going from one path (the ramp) to another (the road). In that case, instead of hearing "Continue straight to stay on Main Street" (because you're not yet on Main Street when you get to that maneuver) you will hear "Continue straight onto Main Street" which makes more sense.

[mcwhittemore]

Thanks for the clarification @lyzidiamond. Lets merge and release this.