[openstreetmap/openstreetmap-website] Collapse all tokens for an app into a single line (#1461)

[Tom Hughes]

@Zverik not your fault - you had no idea I was also working on it.

I've opened #1462 now with my version - it's actually very similar modulo some minor stylistic differences but I did also add some tests as we didn't seem to have much coverage around this stuff.

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