little ui fixes

qt/i2pd_qt/generalsettingswidget.ui

@@ -929,7 +929,7 @@
           <item>
            <widget class="QLabel" name="label_7">
             <property name="text">
-             <string>Port (leave empty to auto-assign):</string>
+             <string>Port (leave 0 to auto-assign):</string>
             </property>
            </widget>
           </item>
@@ -1500,7 +1500,7 @@
           <item>
            <widget class="QLabel" name="bandwidthLabel">
             <property name="text">
-             <string>Bandwidth limit (integer):</string>
+             <string>Bandwidth limit (integer or a letter):</string>
             </property>
            </widget>
           </item>

qt/i2pd_qt/mainwindow.h

@@ -331,7 +331,7 @@ public:
 class UInt16StringItem : public BaseFormattedStringItem {
 public:
     UInt16StringItem(ConfigOption option_, QLineEdit* lineEdit_, QString fieldNameTranslated_) :
-        BaseFormattedStringItem(option_, lineEdit_, fieldNameTranslated_, QApplication::tr("Must be unsigned 16-bit integer")) {};
+        BaseFormattedStringItem(option_, lineEdit_, fieldNameTranslated_, QApplication::tr("Must be unsigned 16-bit integer.")) {};
     virtual ~UInt16StringItem(){}
     virtual bool isValid(){
         auto str=lineEdit->text();