OpenLP: Update to version 2.0.4

This update fixes the following issues with OpenLP:
+
- bnc#864175: Updated to 2.0.4
+ Upstream bugfix/stabilization release
+ Bugs fixed in this release
* lp#1154467: Web download bible db's getting locked
* lp#1173749: Songs with mismatching formatting tags still throw an exception
* lp#1252477: Changing theme on bible settings tab causes an error when saving service
* lp#1012110: pptviewlib does not accept unicode filename
* lp#1199639: Formatting tags opened and closed in different verses throw an exception
* lp#1206886: HTTP Server gets deleted
* lp#1222534: KeyError when "Allow presentation application to be overridden" and Spanish language is selected
* lp#1223841: Transition does not work if texts are the same
* lp#1225763: Replacing background with video unblank screen even if "Blanked to Theme"
* lp#1251437: BibleGateway importer crashes on non unicode urls
* lp#1258634: TypeError when saving service from previous versions with notes
* lp#1259606: Clicking Verse Button doesn't alter live slide
* lp#1266271: Output display returns after pressing esc when looping slides
* lp#1157938: "Alt + Tab" = some pixelated icons and missing icons
* lp#1211049: Can no long download bible verses
* lp#1216234: Layout style has not effect when using a second bible
* lp#1240942: Troubleshooting guide is outdated
* lp#1265368: [regression] Traceback in web remote
* lp#1163874: Add Slovak bible to First Run Wizard

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