Adapted to Catalan translation conventions

Most of software Catalan translations follow some conventions stated by Softcatalà, a non-profit organization that has collaborated in translating famous programs such as Android OS, Linux OS, LibreOffice, Abiword or GIMP. Some of these conventions deal with the verbal tense and level of formality messages should be written in. For example, when the machine sends a message to the user, it must use the Catalan "vós" form, whereas imperative must be used when the user orders the machine to run a command.
For example: 
- A button with the command "Search" --> Cerca (imperative of 2nd person)
- The message "please, wait" --> Espereu, si us plau.

A guide on Catalan translation for software can be found here: https://www.softcatala.org/wiki/Guia_d'estil/Guia_2010/Tota

src/locale/bootstrap-table-ca-ES.js

@@ -1,13 +1,14 @@
 /**
  * Bootstrap Table Catalan translation
- * Author: Marc Pina<iwalkalone69@gmail.com>
+ * Authors: Marc Pina<iwalkalone69@gmail.com>
+ *          Claudi Martinez<claudix.kernel@gmail.com>
  */
 (function ($) {
     'use strict';
 
     $.fn.bootstrapTable.locales['ca-ES'] = {
         formatLoadingMessage: function () {
-            return 'Si us plau esperi...';
+            return 'Espereu, si us plau...';
         },
         formatRecordsPerPage: function (pageNumber) {
             return pageNumber + ' resultats per pàgina';
@@ -16,19 +17,19 @@
             return 'Mostrant de ' + pageFrom + ' fins ' + pageTo + ' - total ' + totalRows + ' resultats';
         },
         formatSearch: function () {
-            return 'Buscar';
+            return 'Cerca';
         },
         formatNoMatches: function () {
             return 'No s\'han trobat resultats';
         },
         formatPaginationSwitch: function () {
-            return 'Amagar/Mostrar paginació';
+            return 'Amaga/Mostra paginació';
         },
         formatRefresh: function () {
-            return 'Refrescar';
+            return 'Refresca';
         },
         formatToggle: function () {
-            return 'Amagar/Mostrar';
+            return 'Alterna formatació';
         },
         formatColumns: function () {
             return 'Columnes';