Handle all legacy English content in the Perseus parser

packages/perseus/src/perseus-types.ts

@@ -1131,6 +1131,7 @@ export type PerseusMeasurerWidgetOptions = {
     rulerLength: number;
     // Containing area [width, height]
     box: [number, number];
+    // TODO(benchristel): static is not used. Remove it?
     // Always false.  Not used for this widget
     static: boolean;
 };

packages/perseus/src/util/parse-perseus-json/perseus-parsers/measurer-widget.ts

@@ -25,6 +25,7 @@ export const parseMeasurerWidget: Parser<MeasurerWidget> = parseWidget(
         rulerPixels: number,
         rulerLength: number,
         box: pair(number, number),
+        // TODO(benchristel): static is not used. Remove it?
         static: defaulted(boolean, () => false),
     }),
 );