[pvr] adds 'Find similar' button to GUIDialogPVRGuideInfo
[lang] shorten label 'Find similar programs' to 'Find similar'
[confluence] adds button 'Find similar' (ID: 4) to DialogPVRGuideInfo
Merge pull request #5112 from xhaggi/pvr-dialog-guide-info-find-similar

[pvr] adds 'Find similar' button to guide info dialog