diff --git a/js/friction/FrictionA11yStrings.js b/js/friction/FrictionA11yStrings.js
deleted file mode 100644
index 16c43656..00000000
--- a/js/friction/FrictionA11yStrings.js
+++ /dev/null
@@ -1,253 +0,0 @@
-// Copyright 2017-2018, University of Colorado Boulder
-
-/**
- * Single location of all accessibility strings.  These strings are not meant to be translatable yet.  Rosetta needs
- * some work to provide translators with context for these strings, and we want to receive some community feedback
- * before these strings are submitted for translation.
- *
- * @author Michael Kauzmann (PhET Interactive Simulations)
- */
-define( function( require ) {
-  'use strict';
-
-  // modules
-  const friction = require( 'FRICTION/friction' );
-
-  const FrictionA11yStrings = {
-
-    chemistryBook: {
-      value: 'Chemistry book'
-    },
-    zoomedInChemistryBook: {
-      value: 'zoomed-in Chemistry book'
-    },
-    grabButtonHelpText: {
-      value: 'Look for grab buttons. Once grabbed, use letter keys W, A, S, or D to move book or zoomed-in book up, left, down, or right.'
-    },
-    moveBookWith: {
-      value: 'Move grabbed book or zoomed-in book up, left, down, or right with Arrow keys, or with letter keys W, A, S, or D.'
-    },
-    moveInSmallerStepsWith: {
-      value: 'Move slower with Shift plus Arrow keys, or Shift plus letter keys W, A, S, or D.'
-    },
-
-    initialGrabbedNotTouching: {
-      value: 'Grabbed. Lightly on Physics book. Move book with W, A, S, or D key. Space to release.'
-    },
-
-    grabbedNotTouching: {
-      value: 'Grabbed. Lightly on Physics book. Move down to rub harder.'
-    },
-
-    initialGrabbedTouching: {
-      value: 'Grabbed. Rub fast or slow with A or D keys. Space to release.'
-    },
-
-    grabbedTouching: {
-      value: 'Grabbed. Rub fast or slow.'
-    },
-
-
-    //--------------------------------------------------------------------------
-    // Amount of atoms strings
-    //--------------------------------------------------------------------------
-
-    amountOfAtoms: {
-      value: 'Chemistry book has {{comparisonAmount}} jiggling atoms as {{breakAwayAmount}} have broken away. '
-    },
-    fewer: {
-      value: 'fewer'
-    },
-    farFewer: {
-      value: 'far fewer'
-    },
-    some: {
-      value: 'some'
-    },
-    many: {
-      value: 'many'
-    },
-
-
-    //--------------------------------------------------------------------------
-    // Jiggle scale strings
-    //--------------------------------------------------------------------------
-
-    jiggleALot: {
-      value: 'jiggle  a lot'
-    },
-
-    jiggleALittle: {
-      value: 'jiggle a little'
-    },
-
-    jiggleABit: {
-      value: 'jiggle a tiny bit'
-    },
-
-    // if jiggled state has not settled
-    slowingDown: {
-      value: 'slowing down'
-    },
-
-    //--------------------------------------------------------------------------
-    // Temp scale strings
-    //--------------------------------------------------------------------------
-
-    superHot: { value: 'super hot' },
-    veryHot: { value: 'very hot' },
-    hot: { value: 'hot' },
-    atWarm: { value: 'warm' },
-    atCool: { value: 'cool' },
-
-    temperaturePattern: {
-      value: 'surface temperature {{thermometer}}is {{temp}}'
-    },
-    thermometer: {
-      value: 'thermometer '
-    },
-
-    // if state has not settled yet
-    temperatureDropping: {
-      value: 'temperature dropping'
-    },
-
-    droppingAsAtomsJiggleLess: {
-      value: 'dropping as atoms jiggle less'
-    },
-
-    atomsJigglePattern: {
-      value: 'atoms {{jiggleAmount}}'
-    },
-
-    jiggleClausePattern: {
-      value: 'and {{jiggleAmount}}'
-    },
-
-    // Entire sentence for jiggling and temp
-    jiggleTemperatureScaleSentence: {
-      value: 'In zoomed-in view of where books meet, {{temperatureClause}}, {{jigglingClause}}.'
-    },
-
-    //--------------------------------------------------------------------------
-    // Other summary sentence strings
-    //--------------------------------------------------------------------------
-
-    moveChemistryBookSentence: {
-      value: 'Grab Chemistry book to play.'
-    },
-
-    moveDownToRubHarderSentence: {
-      value: 'Move down to rub harder.'
-    },
-
-
-    positionMoveDownPattern: {
-      value: '{{position}}. {{moveDownToRubHarder}}'
-    },
-
-    downRubFastOrSlow: {
-      value: 'Down. Rub fast or slow.'
-    },
-
-    resetSimMoreObservationSentence: {
-      value: 'Reset sim to make more observations.'
-    },
-
-    startingChemistryBookPattern: {
-      value: '{{relativeChemistryBookSentence}}Chemistry book rests {{lightly}}on top of a Physics book, and is ready to be rubbed against it.'
-    },
-
-    lightly: {
-      value: 'lighty '
-    },
-
-    summarySentencePattern: {
-      value: '{{chemistryBookString}} {{jiggleTemperatureScaleSentence}}'
-    },
-
-
-    //--------------------------------------------------------------------------
-    //--------------------------------------------------------------------------
-    // Interactive Alerts strings
-    //--------------------------------------------------------------------------
-    //--------------------------------------------------------------------------
-
-
-    //--------------------------------------------------------------------------
-    // Jiggling/Temperature strings
-    //--------------------------------------------------------------------------
-
-    atomsJiggleTinyBitTempCool: {
-      value: 'Atoms jiggle a tiny bit, temperature cool'
-    },
-
-    // jiggling . . .
-    aTinyBit: { value: 'a tiny bit' },
-    aLittle: { value: 'a little' },
-    aLittleMore: { value: 'a little more' },
-    more: { value: 'more' },
-    faster: { value: 'faster' },
-    evenFaster: { value: 'even faster' },
-    superFast: { value: 'super fast' },
-
-    less: { value: 'less' },
-    evenLess: { value: 'even less' },
-    evenCooler: { value: 'even cooler' },
-
-    // temperature . . .
-    cooler: { value: 'cooler' },
-    jigglingLess: { value: 'jiggling less' },
-    nowCooler: { value: 'now cooler' },
-    warmer: { value: 'warmer' },
-    nowWarm: { value: 'now warm' },
-    evenHotter: { value: 'even hotter' },
-    nowHot: { value: 'now hot' },
-    nowHotter: { value: 'now hotter' },
-
-    dropping: { value: 'dropping' },
-
-    frictionIncreasingAtomsJigglingTemperaturePattern: {
-      value: 'Jiggling {{jigglingAmount}}, {{temperature}}'
-    },
-
-    frictionIncreasingAtomsJigglingTemperatureFirstPattern: {
-      value: 'Atoms {{jigglingAmount}}, temperature {{temperature}}'
-    },
-
-    // ----------------------------------------------
-    // very hot cases where we need another string pattern
-    capitalizedVeryHot: {
-      value: 'Very Hot'
-    },
-    capitalizedAFew: {
-      value: 'A few'
-    },
-    capitalizedMore: {
-      value: 'More'
-    },
-    breakAwaySentenceFirst: {
-      value: '{{temp}}. Atoms break away from chemistry book.'
-    },
-    breakAwaySentenceAgain: {
-      value: '{{temp}}. More atoms break away.'
-    },
-    breakAwayNoneLeft: {
-      value: '{{temp}}. Atoms jiggling very fast.'
-    }
-  };
-
-  // TODO: This seems it should be factored out, see https://github.com/phetsims/tasks/issues/917
-  if ( phet.chipper.queryParameters.stringTest === 'xss' ) {
-    for ( const key in FrictionA11yStrings ) {
-      FrictionA11yStrings[ key ].value += '<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVQIW2NkYGD4DwABCQEBtxmN7wAAAABJRU5ErkJggg==" onload="window.location.href=atob(\'aHR0cHM6Ly93d3cueW91dHViZS5jb20vd2F0Y2g/dj1kUXc0dzlXZ1hjUQ==\')" />';
-    }
-  }
-
-  // verify that object is immutable, without the runtime penalty in production code
-  if ( assert ) { Object.freeze( FrictionA11yStrings ); }
-
-  friction.register( 'FrictionA11yStrings', FrictionA11yStrings );
-
-  return FrictionA11yStrings;
-} );
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