Add run script to install.

Also renamed "translations_target" to "translations". The old name was
dumb and annoying.

package/linux/MultiMC

@@ -4,6 +4,8 @@
 MMC_DIR=$(dirname "$0")
 cd "${MMC_DIR}"
 
-export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:"./lib"
-export QT_PLUGIN_PATH=$QT_PLUGIN_PATH:"."
-exec ./bin/MultiMC
+export LD_LIBRARY_PATH="${MMC_DIR}/lib":$LD_LIBRARY_PATH
+export QT_PLUGIN_PATH="${MMC_DIR}/plugins"
+export QT_FONTPATH="${MMC_DIR}/fonts"
+exec ${MMC_DIR}/bin/MultiMC -d ${MMC_DIR} $@
+