Description of problem:
Current it seems publican generates the same .desktop file fields
for all languages ie for all translations of a document.

This makes it hard (impossible) to tell which language one is
choosing when opening documentation from the desktop.

See for example bug 1316398.

Version-Release number of selected component (if applicable):
RHEL 7 docs

How reproducible:
100%

Actual results:
cat > Red_Hat_Enterprise_Linux-Release_Notes-7-ja-JP-7.desktop <<'EOF'
[Desktop Entry]
Name=Red_Hat_Enterprise_Linux 7: Release_Notes
Comment=Release Notes for Red Hat Enterprise Linux 7
Exec=xdg-open %{_docdir}/Red_Hat_Enterprise_Linux-Release_Notes-7-ja-JP-%{version}/index.html
Icon=Red_Hat_Enterprise_Linux-Release_Notes-7-ja-JP
Categories=Documentation;X-Red-Hat-Base;
Type=Application
Encoding=UTF-8
Terminal=false
EOF
```

compared to 

cat > Red_Hat_Enterprise_Linux-Release_Notes-7-en-US-7.desktop <<'EOF'
[Desktop Entry]
Name=Red_Hat_Enterprise_Linux 7: Release_Notes
Comment=Release Notes for Red Hat Enterprise Linux 7
Exec=xdg-open %{_docdir}/Red_Hat_Enterprise_Linux-Release_Notes-7-en-US-%{version}/index.html
Icon=Red_Hat_Enterprise_Linux-Release_Notes-7-en-US
Categories=Documentation;X-Red-Hat-Base;
Type=Application
Encoding=UTF-8
Terminal=false
EOF

ie the Name and Comment for the Japanese RelNotes is identical to the English one which makes it impossible to distinguish them on the desktop.

Expected results:
Red_Hat_Enterprise_Linux-Release_Notes-7-ja-JP-7.desktop should be changed to have Name and Comment based on the Japanese title for the release notes.