Fix form submission on Explore page search

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

js/src/App.vue

@@ -8,7 +8,7 @@
         <p>
           <span v-html="$t('Mobilizon is under development, we will add new features to this site during regular updates, until the release of <b>version 1 of the software in the first half of 2020</b>.')" />
           <i18n path="In the meantime, please consider that the software is not (yet) finished. More information {onBlog}.">
-            <a href='https://framablog.org/?p=18299'>{{ $t('on our blog') }}</a>
+            <a slot="onBlog" href='https://framablog.org/?p=18299'>{{ $t('on our blog') }}</a>
           </i18n>
         </p>
       </b-message>

js/src/views/Event/Explore.vue

@@ -3,7 +3,7 @@
     <h1 class="title">{{ $t('Explore') }}</h1>
     <section class="hero">
       <div class="hero-body">
-        <form @submit="submit()">
+        <form @submit.prevent="submit()">
           <b-field :label="$t('Event')" grouped label-position="on-border">
             <b-input icon="magnify" type="search" size="is-large" expanded v-model="searchTerm" :placeholder="$t('For instance: London, Taekwondo, Architecture…')" />
             <p class="control">