Fix copy conflict dialog translation

backport of fileexist template translations
with minor fixes

apps/files/templates/fileexists.html

@@ -3,8 +3,8 @@
 	<span class="what">{what}<!-- If you select both versions, the copied file will have a number added to its name. --></span><br/>
 	<br/>
 	<table>
-		<th><label><input class="allnewfiles" type="checkbox" />New Files<span class="count"></span></label></th>
-		<th><label><input class="allexistingfiles" type="checkbox" />Already existing files<span class="count"></span></label></th>
+		<th><label><input class="allnewfiles" type="checkbox" />{allnewfiles}<span class="count"></span></label></th>
+		<th><label><input class="allexistingfiles" type="checkbox" />{allexistingfiles}<span class="count"></span></label></th>
 	</table>
 	<div class="conflicts">
 		<div class="template">

core/js/oc-dialogs.js

@@ -358,14 +358,17 @@ var OCdialogs = {
 				//create dialog
 				this._fileexistsshown = true;
 				$.when(this._getFileExistsTemplate()).then(function($tmpl) {
-					var title = t('files','One file conflict');
+					var title = t('core','One file conflict');
 					var $dlg = $tmpl.octemplate({
 						dialog_name: dialog_name,
 						title: title,
 						type: 'fileexists',
 
-						why: t('files','Which files do you want to keep?'),
-						what: t('files','If you select both versions, the copied file will have a number added to its name.')
+						allnewfiles: t('core','New Files'),
+						allexistingfiles: t('core','Already existing files'),
+
+						why: t('core','Which files do you want to keep?'),
+						what: t('core','If you select both versions, the copied file will have a number added to its name.')
 					});
 					$('body').append($dlg);