Small additions to budget handling [skip ci]

resources/lang/en_US/firefly.php

@@ -279,6 +279,7 @@ return [
     'transaction_page_size_help'                => 'Any list of transactions shows at most this many transactions',
     'transaction_page_size_label'               => 'Page size',
     'budget_maximum'                            => 'Budget maximum',
+    'between_dates'                             => '(:start and :end)',
 
     // profile:
     'change_your_password'                      => 'Change your password',

resources/views/reports/partials/balance.twig

@@ -25,11 +25,13 @@
                     {% if balanceLine.getBudget.id %}
                         <td>
                             <a href="{{ route('budgets.show',balanceLine.getBudget.id) }}">{{ balanceLine.getTitle }}</a>
+                            {% if balanceLine.getStartdate and balanceLine.getEnddate %}
                             <span class="small"><br>
                                 {{ balanceLine.getStartdate.formatLocalized(monthAndDayFormat) }}
                                 &mdash;
                                 {{ balanceLine.getEnddate.formatLocalized(monthAndDayFormat) }}
                             </span>
+                            {% endif %}
                         </td>
                         <td>
                             {% if(balanceLine.getBudget.amount) %}