Fixed error handling

Currently translated at 91.2% (448 of 491 strings)

Translation: GPXSee/Translations
Translate-URL: https://hosted.weblate.org/projects/gpxsee/translations/eo/

lang/gpxsee_eo.ts

@@ -172,7 +172,7 @@
     <message>
         <location filename="../src/data/data.cpp" line="251"/>
         <source>VTK files</source>
-        <translation type="unfinished"></translation>
+        <translation>VTK dosieroj</translation>
     </message>
     <message>
         <location filename="../src/data/data.cpp" line="252"/>

lang/gpxsee_fi.ts

@@ -167,12 +167,12 @@
     <message>
         <location filename="../src/data/data.cpp" line="250"/>
         <source>70mai GPS log files</source>
-        <translation type="unfinished"></translation>
+        <translation>70mai GPS -lokitiedostot</translation>
     </message>
     <message>
         <location filename="../src/data/data.cpp" line="251"/>
         <source>VTK files</source>
-        <translation type="unfinished"></translation>
+        <translation>VTK-tiedostot</translation>
     </message>
     <message>
         <location filename="../src/data/data.cpp" line="252"/>

lang/gpxsee_ru.ts

@@ -167,12 +167,12 @@
     <message>
         <location filename="../src/data/data.cpp" line="250"/>
         <source>70mai GPS log files</source>
-        <translation type="unfinished"></translation>
+        <translation>70mai GPS файлы</translation>
     </message>
     <message>
         <location filename="../src/data/data.cpp" line="251"/>
         <source>VTK files</source>
-        <translation type="unfinished"></translation>
+        <translation>VTK файлы</translation>
     </message>
     <message>
         <location filename="../src/data/data.cpp" line="252"/>
@@ -837,7 +837,7 @@
     <message>
         <location filename="../src/GUI/gui.cpp" line="1126"/>
         <source>Error loading geo URI:</source>
-        <translation type="unfinished"></translation>
+        <translation>Ошибка загрузки гео URI:</translation>
     </message>
     <message>
         <location filename="../src/GUI/gui.cpp" line="1132"/>

src/data/vtkparser.cpp

@@ -180,12 +180,15 @@ bool VTKParser::parse(QFile *file, QList<TrackData> &tracks,
 	_errorString = "";
 
 	while (true) {
-		len = file->read((char*)&recordLen, 2);
-		if (len < 0) {
-			_errorString = "I/O error";
-			return false;
-		} else if (len == 0)
-			break;
+		if ((len = file->read((char*)&recordLen, sizeof(recordLen)))
+		  != sizeof(recordLen)) {
+			if (!len)
+				break;
+			else {
+				_errorString = "Error reading VTK record size";
+				return false;
+			}
+		}
 
 		recordLen = qFromLittleEndian(recordLen);
 		ba.resize(recordLen);