[Pidgin] #15128: A couple of typos in the "Add chat" dialog

[Pidgin]

#15128: A couple of typos in the "Add chat" dialog
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 Reporter:  rrt          |       Owner:  EionRobb
     Type:  translation  |      Status:  closed
Milestone:  3.0.0        |   Component:  unclassified
  Version:  2.10.3       |  Resolution:  invalid
 Keywords:               |
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Comment (by rrt):

 This is minor, but not pointless. It's roughly a UI equivalent of putting
 in casts to void to suppress compiler warnings, only more important
 because it affects users.

 I checked, and couldn't find another label for a check box, radio button
 or combo box that ended with a full stop.

 I made the fix myself and created PR#6 on Bitbucket for it.

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Ticket URL: <https://developer.pidgin.im/ticket/15128#comment:5>
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