Fixed issues with escaped strings inside the phrase

We've had issues with phrases that looks like this
"Byt artikel" listar artiklar direkt since the quotes will be escaped in the source. But the backslash escaping the quote should not be a part of the phrase to translate in and of itself.
This is very similar to the issue with newlines we fixed here
#176

I could add more cases (for instance \t) but this is the only one I know we actually use

Author: LinusCenterstrom

MN.L10n.Tests/ParserTests.cs

@@ -115,5 +115,32 @@ public void LineBreakCharInCall()
 
             Assert.Collection(result, x => Assert.Equal("Hello\nBrother", x.Phrase));
         }
+
+        [Fact]
+        public void TestEscapedStringContainerCharacter()
+        {
+            var parser = new L10nParser();
+            var result = parser.Parse(@"_s(""Hello \""friend\"". How it do?"")");
+
+            Assert.Collection(result, x => Assert.Equal(@"Hello ""friend"". How it do?", x.Phrase));            
+        }
+        
+        [Fact]
+        public void TestEscapedStringContainerCharacter2()
+        {
+            var parser = new L10nParser();
+            var result = parser.Parse(@"_s('Hello \""friend\"". How it do?')");
+
+            Assert.Collection(result, x => Assert.Equal(@"Hello \""friend\"". How it do?", x.Phrase));            
+        }
+        
+        [Fact]
+        public void TestEscapedStringContainerCharacter3()
+        {
+            var parser = new L10nParser();
+            var result = parser.Parse(@"_s('Hello \'friend\'. How it do?')");
+
+            Assert.Collection(result, x => Assert.Equal(@"Hello 'friend'. How it do?", x.Phrase));            
+        }
     }
 }

MN.L10n/L10nParser.cs

@@ -181,10 +181,17 @@ bool TryPeek(int forward)
                                 }
                             }
 
-                            if (inToken && !isVerbatim && source[_pos] == '\\' && TryPeek(1) && source[_pos + 1] == 'n')
+                            if (inToken && !isVerbatim && source[_pos] == '\\' && TryPeek(1) && (source[_pos + 1] == 'n' || source[_pos + 1] == _stringContainer))
                             {
+                                if (source[_pos + 1] == 'n')
+                                {
+                                    _tokenContent.Append('\n');
+                                }
+                                else if (source[_pos + 1] == _stringContainer)
+                                {
+                                    _tokenContent.Append(_stringContainer);
+                                }
                                 _pos++;
-                                _tokenContent.Append('\n');
                             }
                             else
                             {