message: This is actually MFileBody not MImageBody, change classname
diff: @@ -295,7 +295,7 @@ module.exports = React.createClass({
  return (
  <span className="mx_MFileBody" ref="body">
  - <div className="mx_MImageBody_download">
  + <div className="mx_MFileBody_download">
  <a href="javascript:void(0)" onClick={decrypt}>
  { _t("Decrypt %(text)s", { text: text }) }
  </a>
  @@ -327,7 +327,7 @@ module.exports = React.createClass({
  }
  return (
  <span className="mx_MFileBody">
  - <div className="mx_MImageBody_download">
  + <div className="mx_MFileBody_download">
  <div style={{display: "none"}}>
  { /*
  * Add dummy copy of the "a" tag
  @@ -347,7 +347,7 @@ module.exports = React.createClass({
  if (this.props.tileShape === "file_grid") {
  return (
  <span className="mx_MFileBody">
  - <div className="mx_MImageBody_download">
  + <div className="mx_MFileBody_download">
  <a className="mx_ImageBody_downloadLink" href={contentUrl} download={fileName} target="_blank">
  { fileName }
  </a>
  @@ -360,7 +360,7 @@ module.exports = React.createClass({
  } else {
  return (
  <span className="mx_MFileBody">
  - <div className="mx_MImageBody_download">
  + <div className="mx_MFileBody_download">
  <a href={contentUrl} download={fileName} target="_blank" rel="noopener">
  <img src={tintedDownloadImageURL} width="12" height="14" ref="downloadImage" />
  { _t("Download %(text)s", { text: text }) }
  