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/cabbiev2.160x128x2.wps

@@ -26,7 +26,7 @@
 %s%al%?ia<%ia|%?d2<%d2|(root)>>
 %s%al%?id<%id|%?d1<%d1|(root)>>
 
-%s%alNext Track:
+%s%al%Sx|Next Track:|
 %s%al%?It<%It|%Fn>
 
 %Vl|b|0|10|-|75|1|-|-|
@@ -34,9 +34,9 @@
 %s%ac%?ia<%ia|%?d2<%d2|(root)>>
 %s%ac%?id<%id|%?d1<%d1|(root)>>
 
-%s%acNext Track:
+%s%ac%Sx|Next Track:|
 %s%ac%?It<%It|%Fn>
 
 %V|0|96|-|10|1|-|-|
-%al %pc%ac%pp of %pe%ar%pr 
+%al %pc%ac%?Sr<%pe %Sx|of| %pp|%pp %Sx|of| %pe>%ar%pr