Merge branch 'master' into simon/angular-universal

* master:
  Update list of supported locales
  Add one more fix to nginx.conf for i18n
  Remove unused i18n tags in frontend/src/index.html
  Update translations from Transifex
  Enable 'fr' locale for French
  Corrected some missing spaces on transactions page and a blank render bug when confirmation time is below 1 minute.
  Implement i18n support in frontend using Angular + Transifex + NGINX

# Conflicts:
#	frontend/src/app/app.constants.ts
#	frontend/sync-assets.js

frontend/src/app/components/statistics/statistics.component.html

@@ -3,7 +3,7 @@
   <div class="row">
     <div class="col-lg-12" *ngIf="loading">
       <div class="text-center">
-        <h3>Loading graphs...</h3>
+        <h3 i18n="statistics.loading-graphs">Loading graphs...</h3>
         <br>
         <div class="spinner-border text-light"></div>
       </div>
@@ -13,7 +13,7 @@
 
       <div class="card mb-3" *ngIf="mempoolStats.length">
         <div class="card-header">
-          <i class="fa fa-area-chart"></i> Mempool by vBytes (sat/vByte)
+          <i class="fa fa-area-chart"></i> <span i18n="statistics.memory-by-vBytes">Mempool by vBytes (sat/vByte)</span>
 
           <form [formGroup]="radioGroupForm" style="float: right;">
             <div class="spinner-border text-light bootstrap-spinner" *ngIf="spinnerLoading"></div>
@@ -54,7 +54,8 @@
     <div class="col-lg-12">
       <div class="card mb-3" *ngIf="mempoolTransactionsWeightPerSecondData">
         <div class="card-header">
-          <i class="fa fa-area-chart"></i> Transaction vBytes per second (vB/s)</div>
+            <i class="fa fa-area-chart"></i> <span i18n="statistics.transaction-vbytes-per-second">Transaction vBytes per second (vB/s)</span>
+        </div>
         <div class="card-body">
           <div style="height: 600px;">
             <app-chartist