i.fft/i.ifft: add keyword for keywords.html

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@56423 15284696-431f-4ddb-bdfa-cd5b030d7da7

imagery/i.fft/main.c

@@ -76,6 +76,7 @@ int main(int argc, char *argv[])
 
     module = G_define_module();
     G_add_keyword(_("imagery"));
+    G_add_keyword(_("transformation"));
     G_add_keyword(_("Fast Fourier Transform"));
     module->description =
 	_("Fast Fourier Transform (FFT) for image processing.");

imagery/i.ifft/main.c

@@ -75,6 +75,7 @@ int main(int argc, char *argv[])
     /* Set description */
     module = G_define_module();
     G_add_keyword(_("imagery"));
+    G_add_keyword(_("transformation"));
     G_add_keyword(_("Fast Fourier Transform"));
     module->description =
 	_("Inverse Fast Fourier Transform (IFFT) for image processing.");