FS#10783 - WPS translation

- Use the %Sx skin tag in WPS to translate 'Next Track', 'Next', and 'of' (X of Y tracks)
- New conditional skin token 'Sr' which checks whether the currently loaded language is an RTL language (Hebrew/Arabic). It uses lang_is_rtl().
- Added Hebrew translation


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@23638 a1c6a512-1295-4272-9138-f99709370657

wps/cabbiev2.132x80x16.wps

@@ -25,11 +25,11 @@
 %s%al%?it<%it|%fn>
 %s%al%?ia<%ia|%?d2<%d2|(root)>>
 %s%al%?id<%id|%?d1<%d1|(root)>>
-%s%alNext: %?It<%It|%Fn>
+%s%al%Sx|Next:| %?It<%It|%Fn>
 
 #NowPlaying - no aa
 %Vl|b|0|10|-|48|1|-|-|
 %s%ac%?it<%it|%fn>
 %s%ac%?ia<%ia|%?d2<%d2|(root)>>
 %s%ac%?id<%id|%?d1<%d1|(root)>>
-%s%acNext: %?It<%It|%Fn>
+%s%ac%Sx|Next:| %?It<%It|%Fn>