Removing the plainValue checks on translatable fields.

Those are always null on translatable fields, thus can't be used here.

Modules/Setting/Resources/views/admin/fields/translatable/number.blade.php

 <div class='form-group'>
     {!! Form::label($settingName . "[$lang]", trans($moduleInfo['description'])) !!}
-    <?php if (isset($dbSettings[$settingName]) && $dbSettings[$settingName]->plainValue !== null): ?>
+    <?php if (isset($dbSettings[$settingName])): ?>
         <?php $value = $dbSettings[$settingName]->hasTranslation($lang) ? $dbSettings[$settingName]->translate($lang)->value : ''; ?>
         {!! Form::input('number', $settingName . "[$lang]", old($settingName . "[$lang]", $value), ['class' => 'form-control', 'placeholder' => trans($moduleInfo['description'])]) !!}
     <?php else: ?>

Modules/Setting/Resources/views/admin/fields/translatable/text.blade.php

 <div class='form-group'>
     {!! Form::label($settingName . "[$lang]", trans($moduleInfo['description'])) !!}
-    <?php if (isset($dbSettings[$settingName]) && $dbSettings[$settingName]->plainValue !== null): ?>
+    <?php if (isset($dbSettings[$settingName])): ?>
         <?php $value = $dbSettings[$settingName]->hasTranslation($lang) ? $dbSettings[$settingName]->translate($lang)->value : ''; ?>
         {!! Form::text($settingName . "[$lang]", old($settingName . "[$lang]", $value), ['class' => 'form-control', 'placeholder' => trans($moduleInfo['description'])]) !!}
     <?php else: ?>

Modules/Setting/Resources/views/admin/fields/translatable/textarea.blade.php

 <div class='form-group'>
     {!! Form::label($settingName . "[$lang]", trans($moduleInfo['description'])) !!}
-    <?php if (isset($dbSettings[$settingName]) && $dbSettings[$settingName]->plainValue !== null): ?>
+    <?php if (isset($dbSettings[$settingName])): ?>
         <?php $value = $dbSettings[$settingName]->hasTranslation($lang) ? $dbSettings[$settingName]->translate($lang)->value : ''; ?>
         {!! Form::textarea($settingName . "[$lang]", old($settingName . "[$lang]", $value), ['class' => 'form-control', 'placeholder' => trans($moduleInfo['description'])]) !!}
     <?php else: ?>

Modules/Setting/Resources/views/admin/fields/translatable/wysiwyg.blade.php

 <div class='form-group'>
     {!! Form::label($settingName . "[$lang]", trans($moduleInfo['description'])) !!}
-    <?php if (isset($dbSettings[$settingName]) && $dbSettings[$settingName]->plainValue !== null): ?>
+    <?php if (isset($dbSettings[$settingName])): ?>
         <?php $value = $dbSettings[$settingName]->hasTranslation($lang) ? $dbSettings[$settingName]->translate($lang)->value : ''; ?>
         {!! Form::textarea($settingName . "[$lang]", old($settingName . "[$lang]", $value), ['class' => 'form-control ckeditor', 'placeholder' => trans($moduleInfo['description'])]) !!}
     <?php else: ?>