chore(languages): use SIP instead of sip in some contexts

assets/languages/en.ts

@@ -561,7 +561,7 @@ Server url not configured.</translation>
     </message>
     <message>
         <source>sipAccountsPlaceholder</source>
-        <translation>Sip account</translation>
+        <translation>SIP account</translation>
     </message>
     <message>
         <source>companiesPlaceholder</source>
@@ -1295,10 +1295,6 @@ your friend&apos;s SIP address or username.</translation>
         <source>proxyAccountsTitle</source>
         <translation>Proxy accounts</translation>
     </message>
-    <message>
-        <source></source>
-        <translation></translation>
-    </message>
     <message>
         <source>eraseAllPasswords</source>
         <translation>ERASE PASSWORDS</translation>
@@ -1380,7 +1376,7 @@ your friend&apos;s SIP address or username.</translation>
     </message>
     <message>
         <source>invalidSipAddress</source>
-        <translation>Invalid sip address.</translation>
+        <translation>Invalid SIP address.</translation>
     </message>
     <message>
         <source>invalidServerAddress</source>

assets/languages/fr_FR.ts

@@ -1293,10 +1293,6 @@ Cliquez ici : <a href="%1">%1</a>
         <source>proxyAccountsTitle</source>
         <translation>Comptes SIP</translation>
     </message>
-    <message>
-        <source></source>
-        <translation></translation>
-    </message>
     <message>
         <source>eraseAllPasswords</source>
         <translation>EFFACER LES MOTS DE PASSE</translation>
@@ -1378,7 +1374,7 @@ Cliquez ici : &lt;a href=&quot;%1&quot;&gt;%1&lt;/a&gt;
     </message>
     <message>
         <source>invalidSipAddress</source>
-        <translation>Adresse sip invalide.</translation>
+        <translation>Adresse SIP invalide.</translation>
     </message>
     <message>
         <source>invalidServerAddress</source>

assets/languages/tr.ts

@@ -561,7 +561,7 @@ Sunucu url&apos;si yapılandırılmadı.</translation>
     </message>
     <message>
         <source>sipAccountsPlaceholder</source>
-        <translation>Sip hesabı</translation>
+        <translation>SIP hesabı</translation>
     </message>
     <message>
         <source>companiesPlaceholder</source>
@@ -1376,7 +1376,7 @@ arkadaşınızın SIP adresini veya kullanıcı adını girin.</translation>
     </message>
     <message>
         <source>invalidSipAddress</source>
-        <translation>Geçersiz sip adresi.</translation>
+        <translation>Geçersiz SIP adresi.</translation>
     </message>
     <message>
         <source>invalidServerAddress</source>