Mobile: Fixes #2847: Fixed text issue in config screen on some devices (#2851)

* fixed text issue on some devices and closes #2847

* changes added to global file

ReactNativeClient/lib/components/global-style.js

@@ -89,6 +89,7 @@ function addExtraStyles(style) {
 		color: style.color,
 		fontSize: style.fontSize * 1.2,
 		fontWeight: 'bold',
+		fontFamily: 'Roboto',
 	};
 
 	style.headerWrapperStyle = {

ReactNativeClient/lib/components/screens/config.js

@@ -239,6 +239,7 @@ class ConfigScreenComponent extends BaseScreenComponent {
 		styles.linkText.borderBottomColor = theme.color;
 		styles.linkText.flex = 0;
 		styles.linkText.fontWeight = 'normal';
+		styles.linkText.fontFamily = 'Roboto';
 
 		styles.headerWrapperStyle = Object.assign({}, styles.settingContainer, theme.headerWrapperStyle);