refactor i18n, only necessary strings can be translated

i18n/i18n.json

@@ -20,15 +20,9 @@
     },
     "it": {
       "open_in_": "apri con ",
-      "cc_": "cc ",
       "bcc_": "ccn ",
       "subject_": "oggetto ",
       "body_": "testo ",
-      "gmail": "Gmail",
-      "outlook": "Outlook",
-      "telegram": "Telegram",
-      "whatsapp": "WhatsApp",
-      "skype": "Skype",
       "call": "chiama",
       "open": "apri",
       "_default": " ",
@@ -37,15 +31,9 @@
     },
     "es": {
       "open_in_": "abrir con ",
-      "cc_": "cc ",
       "bcc_": "cco ",
       "subject_": "asunto ",
       "body_": "cuerpo ",
-      "gmail": "Gmail",
-      "outlook": "Outlook",
-      "telegram": "Telegram",
-      "whatsapp": "WhatsApp",
-      "skype": "Skype",
       "call": "llamar",
       "open": "abrir",
       "_default": " predefinido",
@@ -54,15 +42,8 @@
     },
     "de": {
       "open_in_": "Öffnen in ",
-      "cc_": "cc ",
-      "bcc_": "bcc ",
       "subject_": "Betreff ",
       "body_": "Nachricht ",
-      "gmail": "Gmail",
-      "outlook": "Outlook",
-      "telegram": "Telegram",
-      "whatsapp": "WhatsApp",
-      "skype": "Skype",
       "call": "Anrufen",
       "open": "Öffnen",
       "_default": " mit Standard",
@@ -71,7 +52,6 @@
     },
     "pt": {
       "open_in_": "abrir com ",
-      "cc_": "cc ",
       "bcc_": "cco ",
       "subject_": "assunto ",
       "body_": "corpo ",
@@ -83,15 +63,9 @@
     },
     "fr": {
       "open_in_": "Ouvrir dans ",
-      "cc_": "cc ",
       "bcc_": "cci ",
       "subject_": "sujet ",
       "body_": "contenu ",
-      "gmail": "Gmail",
-      "outlook": "Outlook",
-      "telegram": "Telegram",
-      "whatsapp": "WhatsApp",
-      "skype": "Skype",
       "call": "Appeler",
       "open": "Ouvrir",
       "_default": " par défaut",
@@ -99,16 +73,8 @@
       "copy": "Copier"
     },
     "nl": {
-      "open_in_": "open in ",
-      "cc_": "cc ",
-      "bcc_": "bcc ",
       "subject_": "onderwerp ",
       "body_": "bericht ",
-      "gmail": "Gmail",
-      "outlook": "Outlook",
-      "telegram": "Telegram",
-      "whatsapp": "WhatsApp",
-      "skype": "Skype",
       "call": "bellen",
       "open": "openen",
       "_default": " standaard",
@@ -117,15 +83,8 @@
     },
     "ru": {
       "open_in_": "открыть в ",
-      "cc_": "cc ",
-      "bcc_": "bcc ",
       "subject_": "тема ",
       "body_": "тело ",
-      "gmail": "Gmail",
-      "outlook": "Outlook",
-      "telegram": "Telegram",
-      "whatsapp": "WhatsApp",
-      "skype": "Skype",
       "call": "позвонить",
       "open": "открыть",
       "_default": " по умолчанию",