diff --git a/about/projects/todo.en.tm b/about/projects/todo.en.tm
index c08b040..2703068 100644
--- a/about/projects/todo.en.tm
+++ b/about/projects/todo.en.tm
@@ -1,6 +1,6 @@
-<TeXmacs|1.0.7.17>
+<TeXmacs|1.99.8>
 
-<style|tmdoc>
+<style|<tuple|tmdoc|english|old-spacing>>
 
 <\body>
   <tmdoc-title|To do list for improving the current implementation>
@@ -38,6 +38,10 @@
 
     Perform extensive (automated) checks for memory leaks using
     <name|Valgrind> and implement a marking algorithm.
+
+    <item*|Unit Test>
+
+    More and more unit tests should be written under the GTest framework.
   </description>
 
   <subsection|Improving the speed>
@@ -51,7 +55,7 @@
 
     <item*|Coding style>
 
-    Systematically use ``const ref'' style parameter passing should both
+    Systematically use \Pconst ref\Q style parameter passing should both
     decrease the size of the binary and accelerate the global efficiency.
 
     <item*|Better caching mechanism>
@@ -174,19 +178,19 @@
     <item*|Eequivalent for <TeX> <verbatim|\\topsep>>
 
     In <TeXmacs>, the <verbatim|\\topsep> always equals 0.75em. It should be
-    possible to modify this. For symmetry, we might also introduce a ``bottom
-    sep''.
+    possible to modify this. For symmetry, we might also introduce a \Pbottom
+    sep\Q.
 
     <item*|Resizing macro expansions>
 
     When attempting to resize a macro application to become smaller than the
-    ``<verbatim|x>'', the invisible markers may have undesirable
+    \P<verbatim|x>\Q, the invisible markers may have undesirable
     side-effects.
 
     <item*|Font parameters>
 
-    Separate environment variables for ``typewriter'', ``sans serif'',
-    ``small caps'', ``slant'', etc.
+    Separate environment variables for \Ptypewriter\Q, \Psans serif\Q,
+    \Psmall caps\Q, \Pslant\Q, etc.
 
     Find rendering font as a function of selected font and language?
 
@@ -464,7 +468,7 @@
       <\with|par-par-sep|0fn>
         <item>Explanatory messages on the status bar.
 
-        <item>Better ``mouse button layout'': do as much as possible with
+        <item>Better \Pmouse button layout\Q: do as much as possible with
         left mouse button only and reserve right button for contextual menu.
 
         <item>Fine-grained resizing using keyboard (also allow modification
@@ -595,7 +599,7 @@
     <\itemize>
       <\with|par-par-sep|0fn>
         <item>Automatic correction of formulas <math|\<rightarrow\>> editing
-        mode based on ``slots''.
+        mode based on \Pslots\Q.
 
         <item>Explicit prefix-postfix, prefix-infix and symbol-prefix
         operator types for operators such as <math|!>, <math|-> <abbr|resp.>
@@ -657,7 +661,7 @@
 
   <section|Universal spreadsheet>
 
-  <name|Rationale:> We started to incorporate a ``universal spreadsheet''
+  <name|Rationale:> We started to incorporate a \Puniversal spreadsheet\Q
   facility into <TeXmacs>. The idea is that all dependencies between the
   cells in the sheet are analyzed by <TeXmacs>, but all actual computations
   are delegated to an extern system of your choice, like one of the currently
@@ -695,9 +699,9 @@
       least when the input is a string).
 
       <item>Possibilitity to apply operations to subtable selections. For
-      instance, when selecting part of a column and applying ``sum'', the sum
+      instance, when selecting part of a column and applying \Psum\Q, the sum
       of the column should be computed at the bottom of the selection.
-      Similarly, applying a unary operation such as ``sin'' might apply the
+      Similarly, applying a unary operation such as \Psin\Q might apply the
       operation to each cell in the selection and put the result right next
       to it.
     </itemize>
@@ -903,8 +907,5 @@
   Documentation License".>
 </body>
 
-<\initial>
-  <\collection>
-    <associate|language|english>
-  </collection>
-</initial>
\ No newline at end of file
+<initial|<\collection>
+</collection>>
\ No newline at end of file