Language files should contain translations only.
The process for building the language cache for the language <lang> desired is
- read en.pl files ( the base definition )
- read <lang>.pl files ( replacing english terms )
--> all translated strings appear in <lang>, untranslated strings are in english
--> to find untranslated strings, computed the complement of set of keys in en.pl and set of keys in <lang>.pl

Hope, I could clarify a bit.

-Bernhard

> Gesendet: Montag, 01. Juni 2015 um 22:59 Uhr
> Von: Larsen <larsen007(a)web.de>
> An: "development(a)lists.ipfire.org" <development(a)lists.ipfire.org>
> Betreff: [PATCH] Fix hardcoded strings in pppsetup.cgi
>
> Some strings for PPTP were hardcoded instead of using i18n features.
> 
> Signed-off-by: Lars Schuhmacher <larsen007(a)web.de>
> ---
>   html/cgi-bin/pppsetup.cgi | 6 +++---
>   langs/de/cgi-bin/de.pl    | 3 +++
>   langs/en/cgi-bin/en.pl    | 3 +++
>   langs/es/cgi-bin/es.pl    | 3 +++
>   langs/fr/cgi-bin/fr.pl    | 3 +++
>   langs/it/cgi-bin/it.pl    | 3 +++
>   langs/nl/cgi-bin/nl.pl    | 3 +++
>   langs/pl/cgi-bin/pl.pl    | 3 +++
>   langs/ru/cgi-bin/ru.pl    | 3 +++
>   langs/tr/cgi-bin/tr.pl    | 3 +++
>   10 files changed, 30 insertions(+), 3 deletions(-)
> 
> diff --git a/html/cgi-bin/pppsetup.cgi b/html/cgi-bin/pppsetup.cgi
> index 33f521e..59677a4 100644
> --- a/html/cgi-bin/pppsetup.cgi
> +++ b/html/cgi-bin/pppsetup.cgi
> @@ -793,15 +793,15 @@ print <<END
>           <td colspan='4' width='100%'  
> bgcolor='$color{'color20'}'><b>$Lang::tr{'pptp settings'}</b></td>
>   </tr>
>   <tr>
> -        <td width='25%'>Peer</td>
> +        <td width='25%'>$Lang::tr{'pptp peer'}:</td>
>           <td colspan='3'><input size=50 type='text' name='PPTP_PEER'  
> value='$pppsettings{'PPTP_PEER'}' /></td>
>   </tr>
>   <tr>
> -        <td width='25%'>My Netconfig</td>
> +        <td width='25%'>$Lang::tr{'pptp netconfig'}:</td>
>           <td colspan='3'><input size=50 type='text' name='PPTP_NICCFG'  
> value='$pppsettings{'PPTP_NICCFG'}' /></td>
>   </tr>
>   <tr>
> -        <td width='25%'>PPTP Route <img src='/blob.gif' alt='*'  
> /></td>
> +        <td width='25%'>$Lang::tr{'pptp route'}: <img  
> src='/blob.gif' alt='*' /></td>
>           <td colspan='3'><input size=50 type='text' name='PPTP_ROUTE'  
> value='$pppsettings{'PPTP_ROUTE'}' /></td>
>   </tr>
> 
> diff --git a/langs/de/cgi-bin/de.pl b/langs/de/cgi-bin/de.pl
> index 8adefdf..65277a9 100644
> --- a/langs/de/cgi-bin/de.pl
> +++ b/langs/de/cgi-bin/de.pl
> @@ -1822,6 +1822,9 @@
>   'ppp setup' => 'PPP-Einstellungen',
>   'pppoe' => 'PPPoE',
>   'pppoe settings' => 'Zusätzliche PPPoE-Einstellungen:',
> +'pptp netconfig' => 'Eigene Netzkonfiguration',
> +'pptp peer' => 'Gegenstelle',
> +'pptp route' => 'PPTP Route',
>   'pptp settings' => 'Zusätzliche PPTP-Einstellungen:',
>   'pre-shared key is too short' => 'Pre-shared Schlüsel ist zu kurz',
>   'prefered master' => 'Prefered Master',
> diff --git a/langs/en/cgi-bin/en.pl b/langs/en/cgi-bin/en.pl
> index 43601c8..3e60b00 100644
> --- a/langs/en/cgi-bin/en.pl
> +++ b/langs/en/cgi-bin/en.pl
> @@ -1852,6 +1852,9 @@
>   'ppp setup' => 'PPP setup',
>   'pppoe' => 'PPPoE',
>   'pppoe settings' => 'Additional PPPoE settings:',
> +'pptp netconfig' => 'My Netconfig',
> +'pptp peer' => 'Peer',
> +'pptp route' => 'PPTP Route',
>   'pptp settings' => 'Additional PPTP settings:',
>   'pre-shared key is too short' => 'Pre-shared key is too short.',
>   'prefered master' => 'Prefered Master',
> diff --git a/langs/es/cgi-bin/es.pl b/langs/es/cgi-bin/es.pl
> index 90f4237..1e315a6 100644
> --- a/langs/es/cgi-bin/es.pl
> +++ b/langs/es/cgi-bin/es.pl
> @@ -1417,6 +1417,9 @@
>   'ppp setup' => 'Configuración PPP',
>   'pppoe' => 'PPPoe',
>   'pppoe settings' => 'Configuraciones PPPoE adicionales',
> +'pptp netconfig' => '',
> +'pptp peer' => '',
> +'pptp route' => '',
>   'pptp settings' => 'Configuracion PPTP adicionales',
>   'pre-shared key is too short' => 'La clave pre-compartida es demasiado  
> corta.',
>   'prefered master' => 'Master preferido',
> diff --git a/langs/fr/cgi-bin/fr.pl b/langs/fr/cgi-bin/fr.pl
> index 40053a0..384cc05 100644
> --- a/langs/fr/cgi-bin/fr.pl
> +++ b/langs/fr/cgi-bin/fr.pl
> @@ -1423,6 +1423,9 @@
>   'ppp setup' => 'Installation PPP',
>   'pppoe' => 'PPPoE',
>   'pppoe settings' => 'Paramètres supplémentaires PPPoE :',
> +'pptp netconfig' => '',
> +'pptp peer' => '',
> +'pptp route' => '',
>   'pptp settings' => 'Paramètres supplémentaires PPTP :',
>   'pre-shared key is too short' => 'La clef partagée préliminaire est trop  
> courte.',
>   'prefered master' => 'Maître préféré',
> diff --git a/langs/it/cgi-bin/it.pl b/langs/it/cgi-bin/it.pl
> index 4fde313..050bffd 100644
> --- a/langs/it/cgi-bin/it.pl
> +++ b/langs/it/cgi-bin/it.pl
> @@ -1808,6 +1808,9 @@
>   'ppp setup' => 'PPP setup',
>   'pppoe' => 'PPPoE',
>   'pppoe settings' => 'Additional PPPoE settings:',
> +'pptp netconfig' => '',
> +'pptp peer' => '',
> +'pptp route' => '',
>   'pptp settings' => 'Additional PPTP settings:',
>   'pre-shared key is too short' => 'Pre-shared key is too short.',
>   'prefered master' => 'Prefered Master',
> diff --git a/langs/nl/cgi-bin/nl.pl b/langs/nl/cgi-bin/nl.pl
> index 7468eb9..46b07d4 100644
> --- a/langs/nl/cgi-bin/nl.pl
> +++ b/langs/nl/cgi-bin/nl.pl
> @@ -1760,6 +1760,9 @@
>   'ppp setup' => 'PPP setup',
>   'pppoe' => 'PPPoE',
>   'pppoe settings' => 'Extra PPPoE instellingen:',
> +'pptp netconfig' => '',
> +'pptp peer' => '',
> +'pptp route' => '',
>   'pptp settings' => 'Extra PPTP instellingen:',
>   'pre-shared key is too short' => 'Pre-shared sleutel is te kort.',
>   'prefered master' => 'Voorkeur master',
> diff --git a/langs/pl/cgi-bin/pl.pl b/langs/pl/cgi-bin/pl.pl
> index 02fb531..894a562 100644
> --- a/langs/pl/cgi-bin/pl.pl
> +++ b/langs/pl/cgi-bin/pl.pl
> @@ -1429,6 +1429,9 @@
>   'ppp setup' => 'Konfiguracja PPP',
>   'pppoe' => 'PPPoE',
>   'pppoe settings' => 'Dodatkowe ustawienia PPPoE:',
> +'pptp netconfig' => '',
> +'pptp peer' => '',
> +'pptp route' => '',
>   'pptp settings' => 'Dodatkowe ustawienia PPTP:',
>   'pre-shared key is too short' => 'Klucz współdzielony jest za krótki.',
>   'prefered master' => 'Preferowany Master',
> diff --git a/langs/ru/cgi-bin/ru.pl b/langs/ru/cgi-bin/ru.pl
> index a2a3693..6754b1d 100644
> --- a/langs/ru/cgi-bin/ru.pl
> +++ b/langs/ru/cgi-bin/ru.pl
> @@ -1424,6 +1424,9 @@
>   'ppp setup' => 'Настройки PPP',
>   'pppoe' => 'PPPoE',
>   'pppoe settings' => 'Дополнительные настройки PPPoE:',
> +'pptp netconfig' => '',
> +'pptp peer' => '',
> +'pptp route' => '',
>   'pptp settings' => 'Дополнительные настройки PPTP:',
>   'pre-shared key is too short' => 'Pre-shared key is too short.',
>   'prefered master' => 'Prefered Master',
> diff --git a/langs/tr/cgi-bin/tr.pl b/langs/tr/cgi-bin/tr.pl
> index 89f753e..ced4fd8 100644
> --- a/langs/tr/cgi-bin/tr.pl
> +++ b/langs/tr/cgi-bin/tr.pl
> @@ -1829,6 +1829,9 @@
>   'ppp setup' => 'PPP kurulumu',
>   'pppoe' => 'PPPoE',
>   'pppoe settings' => 'Ek PPPoE ayarları:',
> +'pptp netconfig' => '',
> +'pptp peer' => '',
> +'pptp route' => '',
>   'pptp settings' => 'Ek PPTP ayarları:',
>   'pre-shared key is too short' => 'Ön paylaşımlı anahtar çok kısa.',
>   'prefered master' => 'Tercih edilen yönetici',
>