Fix#409 - Some content in Currency Converter not right-aligned properly in RtL
Fix#59 Currency symbol precedence is opposite of system setting in RTL languages
Description of the changes:
Add a property FlowDirectionHorizontalAlignment in UnitConverter to align some controls to the right (without modifying the FlowDirection of their parent items)
Force FlowDirection of Value1Container and Value2Container to LeftToRight (but align panels to the right)
How changes were validated:
Tested with LtR and RtL languages and with currency symbols on the left and on the right.
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