Clean up arrow icons

public_html/images/icons/arrow-previous-plain.svg

@@ -4,7 +4,7 @@
 <svg
    viewBox="0 0 6.3102736 9.6969385"
    version="1.1"
-   id="svg1106"
+   id="arrow_first"
    width="6.3102736"
    height="9.6969385"
    xmlns="http://www.w3.org/2000/svg"
@@ -12,7 +12,7 @@
   <defs
      id="defs1103" />
   <g
-     id="layer1"
+     id="arrow"
      transform="translate(-92.71506,-46.084171)">
     <path
        id="path9831"