Fixed major sub-task EXT-5931 ( [XUI ATTRIBUTE NOT TRANSLATABLE] People > My...

Fixed major sub-task EXT-5931 ( [XUI ATTRIBUTE NOT TRANSLATABLE] People > My Groups displays English string when no groups added)
- implemented workaround: added <strings> name="no_filtered_groups_msg" & name="no_groups_msg" in panel_people.xml
- also updated value for no_filtered_groups_msg. It was "Try fine...", seems should be "Try finding..."

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branch : product-engine