Removed addTabDialog.newItemPlaceholder which was not used in the AddTabDialog. (wpilibsuite#220)

It was used in the ClassNameCompoonent and ProjectNameComponent and "Add Module" doesn't make sense there.

Author: lizlooney

src/i18n/locales/en/translation.json

@@ -17,7 +17,6 @@
     "example_project": "For example: WackyWheelerRobot",
     "addTabDialog": {
         "title": "Add Tab",
-        "newItemPlaceholder": "Add Module",
         "search": "Search..."
     },
     "PROJECT": "Project",

src/i18n/locales/es/translation.json

@@ -36,7 +36,6 @@
     "COPY": "Copiar",
     "addTabDialog": {
         "title": "Agregar Pestaña",
-        "newItemPlaceholder": "Agregar Módulo",
         "search": "Buscar..."
     },
     "MECHANISMS": "Mecanismos",

src/i18n/locales/he/translation.json

@@ -17,7 +17,6 @@
     "example_project": "לדוגמה: WackyWheelerRobot",
     "addTabDialog": {
         "title": "הוסף כרטיסייה",
-        "newItemPlaceholder": "הוסף מודול",
         "search": "חיפוש..."
     },
     "PROJECT": "פרויקט",

src/reactComponents/ClassNameComponent.tsx

@@ -121,7 +121,6 @@ export default function ClassNameComponent(props: ClassNameComponentProps): Reac
   const renderInput = (): React.JSX.Element => (
     <Antd.Input
       style={{width: getInputWidth()}}
-      placeholder={t('addTabDialog.newItemPlaceholder')}
       value={props.newItemName}
       onChange={handleInputChange}
       onPressEnter={handleAddNewItem}

src/reactComponents/ProjectNameComponent.tsx

@@ -109,7 +109,6 @@ export default function ProjectNameComponent(props: ProjectNameComponentProps):
   const renderInput = (): React.JSX.Element => (
     <Antd.Input
       style={FULL_WIDTH_STYLE}
-      placeholder={t('addTabDialog.newItemPlaceholder')}
       value={props.newItemName}
       onChange={handleInputChange}
       onPressEnter={handleAddNewItem}