TT#160250 'Calculated fields' label changed to 'Language' label

The 'Calculated fields' label is displayed when creating a new
Batch Provisioning template on Admin Panel. This field has a
selector which offers the 'Javascript' and 'Perl' options. The
label may be confusing, since the options are programming languages
(rather than 'calculated' fields) that can be used on provisioning
templates.

Hence, it is more suitable to change the 'Calculated fields' label
to just the 'Language' label. This will also be in concordance with
the JSON property 'lang' (short word for "Language") that can be used
at API level to set the programming language.

Change-Id: Ie944e446bbab845fee644f698023ac1eacf0e866

lib/NGCP/Panel/Form/ProvisioningTemplate/Reseller.pm

@@ -41,7 +41,7 @@ has_field 'description' => (
 
 has_field 'lang' => (
     type => 'Select',
-    label => 'Calculated fields',
+    label => 'Language',
     options => [
         { value => 'js', label => 'JavaScript' },
         { value => 'perl', label => 'Perl' },

lib/NGCP/Panel/Form/ProvisioningTemplate/ResellerAPI.pm

@@ -31,7 +31,7 @@ has_field 'description' => (
 
 has_field 'lang' => (
     type => 'Select',
-    label => 'Calculated fields',
+    label => 'Language',
     options => [
         { value => 'js', label => 'JavaScript' },
         { value => 'perl', label => 'Perl' },