this works fine for now

fphw.cls

@@ -1,4 +1,4 @@
-%% Tareas Estilosas
+%% Stilish homeworks
 %% Felipe Portales-Oliva (f.portales.oliva@gmail.com)
 %% 
 %% Clase para crear respuestas a tareas de manera sencilla
@@ -7,11 +7,14 @@
 \ProvidesClass{fphw}[2019/03/19 LaTeX class to deliver your homework]
 
 % We will use the article class as a template, with a fontsize of 11pt
-\LoadClassWithOptions{article}[]
+\LoadClass{article}[onecolumn]
 
 % UTF-8 is best coding
 \RequirePackage[utf8]{inputenc}
 
+% We load languages
+\RequirePackage[spanish,british]{babel}
+
 % We won't need those ugly margins
 \RequirePackage{geometry}
 
@@ -21,6 +24,30 @@
 % Header and footers, we will use the titles also
 \RequirePackage{fancyhdr,titling}
 
+\DeclareOption{twocolumn}{\OptionNotUsed}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%%%%%%%%% Language support
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+% we hardcode some language options
+\DeclareOption{spanish}{
+    \newcommand{\CourseLang}{Curso}
+    \newcommand{\ProfessorLang}{Docente}
+    \newcommand{\DateLang}{Fecha de entrega}
+    \newcommand{\StudentLang}{Nombre estudiante}
+    \selectlanguage{spanish}
+}
+
+\DeclareOption{english}{
+    \newcommand{\CourseLang}{Course}
+    \newcommand{\ProfessorLang}{Professor}
+    \newcommand{\DateLang}{Due date}
+    \newcommand{\StudentLang}{Student name}
+    \selectlanguage{british}
+}
+
+
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
 % We define the macro for the name of the professor
@@ -33,8 +60,8 @@
 \newcommand{\institute}[1]{ \renewcommand{\institute}{#1} }
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-% Redefine the title for the class
+%%%%%%%%%% Redefine the title for the class
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \renewcommand{\maketitle}{%
     \thispagestyle{plain}
     \begin{center}
@@ -42,13 +69,13 @@
         \hrule
         \vspace{10pt}
         {\LARGE \bfseries \@title} \\[5pt]
-        Student name: {\itshape \@author}
+        \StudentLang: {\itshape \@author}
         \vspace{8pt}
         \hrule
         \vspace{10pt}
-        Course: {\itshape\class} -- Professor: {\itshape\professor} 
+        \CourseLang: {\itshape\class} -- \ProfessorLang: {\itshape\professor} 
         \\
-        Due date: {\itshape\@date}
+        \DateLang: {\itshape\@date}
         \vspace{20pt}
     \end{center}
 }
@@ -72,8 +99,12 @@
 % Standard
 \DeclareOption{standard}{\geometry{left=2.5cm,right=2.5cm,top=2.5cm,bottom=2.5cm}}
 
+%%% Set paper size for document
+\DeclareOption{a4}{\geometry{a4paper}}
+\DeclareOption{letter}{\geometry{letterpaper}}
+
 % two columns are really difficult to grade, this is to avoid them
-\DeclareOption{twocolumn}{\OptionNotUsed}
+% \DeclareOption{twocolumn}{\OptionNotUsed}
 
 % the user can put their name on the header and footers along other info
 \DeclareOption{decorate}{  
@@ -88,13 +119,25 @@
     \fancyfoot[RO] {\footnotesize\itshape\theauthor}
 }
 
+% if no decoratios indicated, we do not decorate
+\DeclareOption{donotdecorate}{\pagestyle{plain}}
+
+
+
+%%%%% These are the default options
+\ExecuteOptions{donotdecorate,a4}
+
 % As we loaded the article class we need to pass it options not specifically 
 % defined, such as font size
-\DeclareOption*{\PassOptionsToClass{\CurrentOption}{article}}
+\DeclareOption*{\ClassWarningNoLine{fphw}{\CurrentOption not recognized}}
 
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 % This is the point when we pass the options
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \ProcessOptions\relax
 
-
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 % we finish the class
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \endinput

test.tex

@@ -1,18 +1,22 @@
 % this is a test document for the class we defined in this project
 
-\documentclass[11pt,standard,decorate,a4paper]{fphw}
+\documentclass[standard,decorate,spanish,letter]{fphw} 
 
 \usepackage{lipsum,mathpazo} 
   
   
+ 
 \title{Solución Tarea \#1}
 \author{Felipe Ignacio Portales Oliva} 
+
 \date{\today}
 \professor{Dr. G. Rubilar} 
 \class{Teoría General de la Relatividad I}
 \institute{Universidad de Concepción \\ Programa de Magíster en Ciencias con Mención en Física}
 
 
+
+        
 \begin{document}
 \maketitle  
    \section{Lorem}       
@@ -21,7 +25,7 @@
 \subsection{Ipsum}
 \lipsum[4-5]
 \subsubsection{Dolor}  
-\lipsum[6-20] 
+\lipsum[6-10]