Testing help for first translation

[Anadon]

Hello all,

I am trying to see if my first translation is working.  I am invoking
using `LANG=UK LC_ALL=UK LOCALEDIR=./po/ ./build/src/primes`, and have
the following in main:

```
int main(int argc, char **argv) {

  const char* PACKAGE = "primes/0.4.0/";
  const char* LOCALEDIR = secure_getenv("LOCALEDIR");
  if(LOCALEDIR == nullptr){
    LOCALEDIR = "/share/locale";
  }

  setlocale (LC_ALL, "");
  bindtextdomain (PACKAGE, LOCALEDIR);
  textdomain (PACKAGE);
```

and the following files referenced:

```
$ ls po/primes/0.4.0/
en.po  primes.pot  uk.po
```

What newbie mistake am I not seeing?