Do you want only the Panel aligned to left or do you want all controls aligned to the left?
Have you tried that:
<script id='sap-ui-bootstrap' type='text/javascript' src='https://sapui5.hana.ondemand.com/resources/sap-ui-core.js'
data-sap-ui-libs="sap.ui.ux3, sap.ui.commons"
data-sap-ui-theme="sap_bluecrystal"
data-sap-ui-language="iw_IL"
data-sap-ui-rtl="false"
></script>
... without overwriting css.