Fixes to digiKam GUI

[Antoni Bella Pérez]

  Hi,

  I found the following.

  Upercase:
  * change EXIF and exif to Exif:
  - digikam.po (28 times, with exceptions)
  - org.kde.digikam.appdata.po (1 time)

  * change Iptc to IPTC:
  - digikam.po (7 times, with exceptions)
  - org.kde.digikam.appdata.po (1 time)

  * change Xmp to XMP:
  - digikam.po (5 times, with exceptions)
  - org.kde.digikam.appdata.po (1 time)

  Bad tagging:
core/dplugins/generic/metadata/metadataedit/exif/exifcaption.cpp:151
core/dplugins/generic/metadata/metadataedit/exif/exifdevice.cpp:324
  <b>Note: <b><a href='https://en.wikipedia.org/wiki/EXIF'>EXIF</a></b> text 
  tags marked by (*) only support printable <b><a href='https://en.wikipedia.
  org/wiki/Ascii'>ASCII</a></b> characters.</b>

core/dplugins/generic/metadata/metadataedit/exif/exifdevice.cpp:159
  <b>Warning: EXIF <b><a href='https://en.wikipedia.org/wiki/
  Exchangeable_image_file_format#MakerNote_data'>Makernotes</a></b> can be 
  unreadable if you set wrong device manufacturer/model description.</b>

  Regards
  Toni
-- 
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Dubta que el Sol es mogui.
Dubta que la veritat sigui mentida.
Però no dubtis mai que t'estimo.
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