Running test through piped translation test,

~$ echo "Hola" | apertium es-eo
Error: Cannot open file '/usr/share/apertium/apertium-eo-es/es-eo.automorf.bin' for reading.
Error: Cannot open file '/usr/share/apertium/apertium-eo-es/es-eo.autopgen.bin' for reading.
Error: Cannot open file '/usr/share/apertium/apertium-eo-es/es-eo.autobil.bin' for reading.Error: can't stat file '/usr/share/apertium/apertium-eo-es/es-eo.t1x.bin'.

Error: Cannot open file '/usr/share/apertium/apertium-eo-es/es-eo.autogen.bin' for reading.
apertium-tagger: can't open SERIALISED_TAGGER file "/usr/share/apertium/apertium-eo-es/es-eo.prob"
Try 'apertium-tagger --help' for more information.
I/O I/O I/O I/O I/O warning : warning : warning : warning : I/O failed to load "/usr/share/apertium/apertium-eo-es/apertium-eo-es.es-eo.antaux2_t2x": No such file or directory
warning : failed to load "/usr/share/apertium/apertium-eo-es/apertium-eo-es.es-eo.t3x": No such file or directory
failed to load "/usr/share/apertium/apertium-eo-es/apertium-eo-es.es-eo.antaux3_t2x": No such file or directory
failed to load "/usr/share/apertium/apertium-eo-es/apertium-eo-es.es-eo.antaux4_t2x": No such file or directory
warning : failed to load "/usr/share/apertium/apertium-eo-es/apertium-eo-es.es-eo.antaux1_t2x": No such file or directory
failed to load "/usr/share/apertium/apertium-eo-es/apertium-eo-es.es-eo.antaux5_t2x": No such file or directory
Error: Could not parse file 'Error: Could not parse file 'Error: Could not parse file '/usr/share/apertium/apertium-eo-es/apertium-eo-es.es-eo.antaux2_t2x/usr/share/apertium/apertium-eo-es/apertium-eo-es.es-eo.t3xError: Could not parse file ''./usr/share/apertium/apertium-eo-es/apertium-eo-es.es-eo.antaux3_t2x'.Error: Could not parse file 'Error: Could not parse file '/usr/share/apertium/apertium-eo-es/apertium-eo-es.es-eo.antaux4_t2x'.

/usr/share/apertium/apertium-eo-es/apertium-eo-es.es-eo.antaux1_t2x/usr/share/apertium/apertium-eo-es/apertium-eo-es.es-eo.antaux5_t2x'.
'.'.

I/O warning : failed to load "/usr/share/apertium/apertium-eo-es/apertium-eo-es.es-eo.t2x": No such file or directory
Error: Could not parse file '/usr/share/apertium/apertium-eo-es/apertium-eo-es.es-eo.t2x'.

While package has following files,

$ ls /usr/share/apertium/apertium-es-eo/
apertium-eo-es.es-eo.antaux1_t2x  apertium-eo-es.es-eo.antaux4_t2x  apertium-eo-es.es-eo.t2x  es-eo.antaux2_t2x.bin  es-eo.antaux5_t2x.bin  es-eo.automorf.bin  es-eo.rlx.bin  es-eo.t3x.bin
apertium-eo-es.es-eo.antaux2_t2x  apertium-eo-es.es-eo.antaux5_t2x  apertium-eo-es.es-eo.t3x  es-eo.antaux3_t2x.bin  es-eo.autobil.bin      es-eo.autopgen.bin  es-eo.t1x.bin
apertium-eo-es.es-eo.antaux3_t2x  apertium-eo-es.es-eo.t1x          es-eo.antaux1_t2x.bin     es-eo.antaux4_t2x.bin  es-eo.autogen.bin      es-eo.prob          es-eo.t2x.bin

Also see, similar bug: https://bugs.debian.org/1121045