There are strings marked for translation such as "meter,meters,m",
"yard,yards,yd", "fathom,fathoms,ftm" etc.

If these strings are translated conversion is not working for the
units they correspond to. If the translated string is the same as the
original, the conversion will work.

Steps to reproduce: 

1. Install the gettext package, If it is not already installed.  

This will provided the command "msgfmt".

2.  Install the intltool package if it is not already installed.  

This will provide the command "intltool-update".

3. Select a locale that gcalctool supports.

If you don't have supported locale fin your system, find out how to
generate one in your distribution.

$ locale -a
bg_BG.utf8
C
[cut]
en_GB.utf8
[cut]

In this report "en_GB.utf8" will be used. 

4. Update the localisation strings 

 $ cd gcalctool/po
gcalctool/po$ cp en_GB.po new_en_GB.po
gcalctool/po$ intltool-update new_en_GB # Without the .po suffix

5. Edit the updated new_en_GB.po file

Find one or more strings of the specified type. Type something for the
translation of the string that is not the same as the original. This
is to simulate a translation, where the words will be different. Save
the file.

Example strings:
"meter,meters,m"
"yard,yards,yd"
"fathom,fathoms,ftm"

The string does not matter, as long as you test with the same unit
later.

6. Prepare a compiled catalog. 

gcalctool/po$ msgfmt new_en_GB.po  -o new_en_GB.mo

If no errors were found, the program should quit without output.

7. Copy the compiled catalog where the program can find and use it.

I am testing with JHBuild, so I used the JHBuild configured
installation path / prefix "~/gnome-trunk/". The rest should be the
same.

gcalctool/po$ cp new_en_GB.mo ~/gnome-trunk/share/locale/en_GB/LC_MESSAGES/gcalctool.mo

7. Start the program with the prepared locale 

gcalctool/po$ LC_ALL=en_GB.utf8 jhbuild run gcalctool 

If you are testing without JHBuild, just add the "LC_ALL=en_GB.utf8"
in front the actual command. For example:

gcalctool/src$ LC_ALL=en_GB.utf8  ./gcalctool # local directory
or 
$ LC_ALL=en_GB.utf8  gcalctool # system wide

The locale alias should be taken from the output of the "locale -a"
command in step 3.

8. Select Mode/Advanced

9. In the left combo box select the unit for which you changed the
translation string. For example under "Length" choose "Yards" or
"Meters".

10. Type a number in the input area.

The conversion should fail. If you change the unit in the right combo
box, the conversion will still fail.

Other conversion for untranslated strings should work (step 11).

11. Working conversions 

In the left combo box select a unit that does not have translated
string of the specified type. For example "Parsecs". In the right combo
box select a unit that has no translation for the specified string
type. For example "Light years". Conversion will fail when a unit with
translated string of the specified type is selected in the right combo
box.

Without translation these conversions work. Start the program with
"LC_ALL=C" in step 7. Follow the steps 7-10.

If the translated strings are exactly the same as the original,
conversions will work.  To reproduce this behaviour, start at step 5,
but copy the original string in the translated one. Follow steps 5-10.

Other small issues in the same scope:
- Conversion always fails from/to "Nautical miles" and
  "A*u*stronomical units" to any other unit. This happens with or
  without translation.
- The "A*u*stronomical units" unit name ls misspelled.