add lots of fonts and small refactoring

Dockerfile

@@ -5,16 +5,36 @@ MAINTAINER Andrey Arapov <andrey.arapov@nixaid.com>
 # To avoid problems with Dialog and curses wizards
 ENV DEBIAN_FRONTEND noninteractive
 
+# Install GTK, pulseaudio and fonts
+RUN apt-get update && \
+    apt-get install -y libcanberra-gtk-module libexif12 pulseaudio paxctl \
+                       fonts-opensymbol ttf-ubuntu-font-family \
+                       fonts-tlwg-waree-ttf fonts-tlwg-umpush-ttf \
+                       fonts-tlwg-typo-ttf fonts-tlwg-typist-ttf \
+                       fonts-tlwg-typewriter-ttf fonts-tlwg-sawasdee-ttf \
+                       fonts-tlwg-purisa-ttf fonts-tlwg-norasi-ttf \
+                       fonts-tlwg-mono-ttf fonts-tlwg-loma-ttf \
+                       fonts-tlwg-laksaman-ttf fonts-tlwg-kinnari-ttf \
+                       fonts-tlwg-garuda-ttf fonts-tibetan-machine \
+                       fonts-takao-pgothic fonts-symbola fonts-sil-padauk \
+                       fonts-sil-abyssinica fonts-nanum fonts-lohit-guru \
+                       fonts-lklug-sinhala fonts-liberation fonts-lao \
+                       fonts-khmeros-core fonts-kacst fonts-kacst-one \
+                       fonts-guru-extra fonts-freefont-ttf fonts-dejavu-core && \
+    rm -rf -- /var/lib/apt/lists /tmp/*.deb
+
+# Obtain Google Chrome
 ADD https://dl.google.com/linux/direct/google-talkplugin_current_amd64.deb /tmp/google-talkplugin_current_amd64.deb
 ADD https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb /tmp/google-chrome-stable_current_amd64.deb
 
+# Install Google Chrome and its dependencies
 RUN sh -c 'dpkg -i /tmp/google-chrome-stable_current_amd64.deb \
            /tmp/google-talkplugin_current_amd64.deb 2>/dev/null; exit 0' && \
     apt-get update && \
     apt-get -fy install && \
-    apt-get install -y libcanberra-gtk-module libexif12 pulseaudio paxctl && \
     rm -rf -- /var/lib/apt/lists /tmp/*.deb
 
+
 # Workaround: pulseaudio client library likes to remove /dev/shm/pulse-shm-*
 #             files created by the host, causing sound to stop working.
 #             To fix this, we either want to disable the shm or mount /dev/shm