Japanese translation improvements

[danpaz]

Issue

More follow up from #290 further improving our Japanese translations:

• Remove incorrect / superfluous characters in "nth" arrival instructions, replacing "{nth}目の目的地" ({nth} eye destination") with "{nth}目の目的地" ("{nth} destination").
• Consistently use honorific phrases with -masu suffix.
• Improve non-exit variations of the "off ramp" instruction. Even when there's no exit information we were using "出口" ("exit") in the phrase.

@1ec5 @yuryleb I have not synced these or previous changes with Transifex yet, let me know the best way to go about doing that. Do I simply upload this JSON document in the Transifex UI?

Tasklist

• [x] Upate test fixtures
• [x] Add changelog entry
• [ ] Test with osrm-frontend (?)
• [x] Review

Requirements / Relations

Link any requirements here. Other pull requests this PR is based on?

[tsuz]

What actually goes into {nth}?

[danpaz]

What actually goes into {nth}?

@tsuz Here's the logic that populates the {nth} string: https://github.com/Project-OSRM/osrm-text-instructions/blob/master/index.js#L228

Basically:

• If there is only a single waypoint, in a simple A to B route, {nth} is replaced by an empty string
• If there are multiple waypoints along a route, {nth} is replaced with one of these numbered strings from 1 to 10: https://github.com/Project-OSRM/osrm-text-instructions/blob/master/languages/translations/ja.json#L8-L17

So after the replacement we will have these variations:

n	EN	JA
--	You have arrived at your destination	目的地に到着しました
1	You have arrived at your first destination	1 つ目の目的地に到着しました
2	You have arrived at your second destination	2 つ目の目的地に到着しました

[1ec5]

Do I simply upload this JSON document in the Transifex UI?

The usual workflow is to download a translatable JSON from Transifex, make your edits, and upload it back to Transifex. If that translatable JSON is similar enough, I guess you could skip the first step. But take care not to “translate” any strings with anything you’re unsure about.

[1ec5]

I usually just add the translations in manually.

[danpaz]

Ok, Transifex is now up to date.

[1ec5]

Superseded by #312.