Rename info symptom header into back button

components/header/index.js

@@ -2,7 +2,7 @@ import React from 'react'
 import { Dimensions } from 'react-native'
 import CycleDayHeader from './cycle-day'
 import DefaultHeader from './default'
-import InfoSymptomHeader from './info-symptom'
+import BackButtonHeader from './back-button'
 import SymptomViewHeader from './symptom-view'
 
 export default function Header(p) {
@@ -16,7 +16,7 @@ export default function Header(p) {
     return (<SymptomViewHeader {...props} />)
   }
   else if (props.title === 'info') {
-    return (<InfoSymptomHeader {...props} />)
+    return (<BackButtonHeader {...props} />)
   }
   else {
     return (<DefaultHeader {...props} />)