Some cleanup

views/LastSessionsView.js

@@ -20,6 +20,8 @@ import DataAnalysis from '../data_processing/DataAnalysis';
 import * as msgpack from 'msgpack-lite';
 import { timeSince } from '../utility/TimeUtils';
 import XMLParser from 'react-xml-parser';
+import i18n from 'i18n-js';
+
 
 function SessionCard(props) {
   return (
@@ -251,7 +253,7 @@ class LastSessionsView extends React.Component {
         <StatusBar barStyle="light-content" backgroundColor="rgba(0,0,0,0.4)" translucent={true} />
         <View style={{ flex: 1 }}>
           <ImageHeader
-            text="LETZTE SESSIONS"
+            text={ i18n.t('lastSessions').toUpperCase() }
             navigation={this.props.navigation}
             image={require("../assets/swimmer.jpg")}
           />

views/MainMenuView.js

@@ -69,7 +69,7 @@ function ButtonGrid(props) {
           activeOpacity={0.6}
         >
           <MaterialCommIcon name="swim" style={buttonGridStyles.icon}></MaterialCommIcon>
-          <Text style={buttonGridStyles.buttonText}>{ i18n.t('mainMenu_lastSessions').toUpperCase().split(" ").join("\n") }</Text>
+          <Text style={buttonGridStyles.buttonText}>{ i18n.t('lastSessions').toUpperCase().split(" ").join("\n") }</Text>
         </TouchableOpacity>
       </View>
       <View style={buttonGridStyles.columnContainer}>