Fix some titles color

resources/js/views/About.vue

@@ -1,7 +1,7 @@
 <template>
     <div class="columns is-centered">
         <div class="form-column column is-two-thirds-tablet is-half-desktop is-one-third-widescreen is-one-third-fullhd">
-            <h1 class="title">{{ $t('commons.about') }}</h1>
+            <h1 class="title has-text-grey-dark">{{ $t('commons.about') }}</h1>
             <p class="block">
                 <span class="has-text-white"><span class="is-size-5">2FAuth</span> v{{ appVersion }}</span><br />
                 {{ $t('commons.2fauth_teaser')}}

resources/js/views/Groups.vue

@@ -1,7 +1,7 @@
 <template>
     <div class="columns is-centered">
         <div class="form-column column is-two-thirds-tablet is-half-desktop is-one-third-widescreen is-one-third-fullhd">
-            <h1 class="title">
+            <h1 class="title has-text-grey-dark">
                 {{ $t('groups.groups') }}
             </h1>
             <div class="is-size-7-mobile">

resources/js/views/twofaccounts/Import.vue

@@ -2,7 +2,7 @@
     <div>
         <div class="columns is-centered">
             <div class="form-column column is-two-thirds-tablet is-half-desktop is-one-third-widescreen is-one-third-fullhd">
-                <h1 class="title">
+                <h1 class="title has-text-grey-dark">
                     {{ $t('twofaccounts.import.import') }}
                 </h1>
                 <div class="is-size-7-mobile" v-html="$t('twofaccounts.import.import_legend')">