[Thesis] Add date to diagrams

thesis/5-Overview-EN-Wiki.tex

@@ -231,13 +231,13 @@ A lot of public filters on the other hand still assume good faith from the edito
 \begin{figure}
 \centering
   \includegraphics[width=1\columnwidth]{pics/active-public-actions-big.png}
-  \caption{EN Wikipedia edit filters: Filters actions for enabled public filters}~\label{fig:active-public-actions}
+    \caption{EN Wikipedia edit filters: Filters actions for enabled public filters (January 2019)}~\label{fig:active-public-actions}
 \end{figure}
 
 \begin{figure}
 \centering
   \includegraphics[width=1\columnwidth]{pics/active-hidden-actions-big.png}
-  \caption{EN Wikipedia edit filters: Filters actions for enabled hidden filters}~\label{fig:active-hidden-actions}
+    \caption{EN Wikipedia edit filters: Filters actions for enabled hidden filters (January 2019)}~\label{fig:active-hidden-actions}
 \end{figure}
 
 \subsection{What Do Filters Target}