Client: refactor + minor changes

mpwo_client/src/components/App.jsx

@@ -3,7 +3,7 @@ import { Redirect, Route, Switch } from 'react-router-dom'
 
 import './App.css'
 import Admin from './Admin'
-import Activity from './Activities/index'
+import Activity from './Activity/index'
 import Dashboard from './Dashboard'
 import Logout from './User/Logout'
 import NavBar from './NavBar'

mpwo_client/src/components/Dashboard/Statistics.jsx

@@ -45,7 +45,7 @@ class Statistics extends React.Component {
         </div>
         <div className="card-body">
           {Object.keys(statistics).length === 0 ? (
-            'No activities!'
+            'No workouts'
           ) : (
             <div className="chart-month">
               <div className="row chart-radio">

mpwo_client/src/components/Dashboard/UserStatistics.jsx

@@ -13,7 +13,7 @@ export default function UserStatistics (props) {
             </div>
             <div className="col-9 text-right">
               <div className="huge">{user.nbActivities}</div>
-              <div>{user.nbActivities === 1 ? 'activity' : 'activities'}</div>
+              <div>{`workout${user.nbActivities !== 1 && 's'}`}</div>
             </div>
           </div>
         </div>

mpwo_client/src/components/NavBar/index.jsx

@@ -42,7 +42,7 @@ function NavBar(props) {
                       pathname: '/activities/add',
                     }}
                   >
-                    Add a workout
+                    Add workout
                   </Link>
                 </li>
               )}