fit conventions better

src/components/menu-bar/menu-bar.css

@@ -85,7 +85,7 @@
     background-color: $ui-black-transparent;
 }
 
-.growableMenuBarItem {
+.menu-bar-itam.growable {
     max-width: 12rem;
     flex: 1;
 }

src/components/menu-bar/menu-bar.jsx

@@ -393,7 +393,7 @@ class MenuBar extends React.Component {
                         <FormattedMessage {...ariaMessages.tutorials} />
                     </div>
                     <Divider className={classNames(styles.divider)} />
-                    <div className={classNames(styles.menuBarItem, styles.growableMenuBarItem)}>
+                    <div className={classNames(styles.menuBarItem, styles.growable)}>
                         <MenuBarItemTooltip
                             enable
                             id="title-field"

src/components/menu-bar/project-title-input.css

@@ -2,6 +2,11 @@
 @import "../../css/units.css";
 @import "../../css/z-index.css";
 
+/*
+If project-title-input.jsx is part of a menu bar say menu-bar.jsx, it can have additional css classes that
+can set a width for example or what it should do in a flex box (eg. grow).
+*/
+
 .title-field {
     border: 1px dashed $ui-black-transparent;
     border-radius: $form-radius;