[OpenStreetMap] #5398: Add an increase / decrease font size button

[OpenStreetMap]

#5398: Add an increase / decrease font size button
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  Reporter:  jidanni      |      Owner:  rails-dev@…
      Type:  enhancement  |     Status:  new
  Priority:  minor        |  Milestone:
 Component:  website      |    Version:
Resolution:               |   Keywords:  older users
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Comment (by jidanni):

 Yes I know about what CTRL++++ does.

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Ticket URL: <https://trac.openstreetmap.org/ticket/5398#comment:1>
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