[kde-doc-english] Fix typo into KStars doc

[Antoni Bella Pérez]

  Hi dears,

  With last change made are ten pages (Ekos added):

kdeedu/kstars_config.po
The <guilabel>Configure &kstars;</guilabel> window is divided into nine 
pages: <guilabel>Catalogs</guilabel>, <guilabel>Solar System</guilabel>, 
<guilabel>Satellites</guilabel>, <guilabel>Supernovae</guilabel>, 
<guilabel>Guides</guilabel>, <guilabel>Colors</guilabel>, <guilabel>INDI</
guilabel>, <guilabel>Ekos</guilabel>, <guilabel>Xplanet</guilabel>, and 
<guilabel>Advanced</guilabel>.

  Regards
  Toni