Updated Basque translation.
MainFrm: Use the volume step setting for the audio boost increments/decrements.
AppSettings: Change nVolumeStep and nSpeedStep to unsigned.
Updated German translation.
Page "Formats": a list of extensions in the input field is now synchronized with the general list.
Translation script: improve the detection of untranslatable strings.
PPageMisc: center-align buttons
CPPageExternalFilters: fix a warning

The warning was introduced in d5e3c09
Also assign values to struct members in the order the struct was defined
CPPageFormats: fix warnings introduced in 9c67509
Merged pull request #77.

Conflicts:
	src/mpc-hc/mpcresources/mplayerc.de.rc