- Enhancement (svgIcons): Fix JSDoc param def; add alt options

- Accessibility: Begin work, add aria-label to some buttons and
    form controls; add `role=main`; `<img alt>`; `<iframe title>`
- i18n: Add `lang` attribute
- Refactoring: lbs, simplify i18nized element retrieval call
- Docs: Some JSDoc descriptions, JSDoc spacing, fix svgIcons param
    def; add todo
- Testing: Avoid reporting meta-viewport (have own zooming
    controls and difficult to fix)

editor/extensions/ext-locale/server_moinsave/en.js

@@ -1,3 +1,4 @@
 export default {
-  saved: 'Saved! Return to Item View!'
+  saved: 'Saved! Return to Item View!',
+  hiddenframe: 'Moinsave frame to store hidden values'
 };

editor/extensions/ext-locale/server_moinsave/server_opensave/en.js

@@ -0,0 +1,4 @@
+export default {
+  uploading: 'Uploading...',
+  hiddenframe: 'Opensave frame to store hidden values'
+};

editor/extensions/ext-locale/server_moinsave/server_opensave/zh-CN.js

@@ -0,0 +1,4 @@
+export default {
+  uploading: '正在上传...',
+  hiddenframe: 'Opensave frame to store hidden values'
+};

editor/extensions/ext-locale/server_moinsave/zh-CN.js

@@ -1,3 +1,4 @@
 export default {
-  saved: '已保存! 返回视图!'
+  saved: '已保存! 返回视图!',
+  hiddenframe: 'Moinsave frame to store hidden values'
 };

editor/extensions/ext-locale/server_opensave/en.js

@@ -1,3 +0,0 @@
-export default {
-  uploading: 'Uploading...'
-};

editor/extensions/ext-locale/server_opensave/zh-CN.js

@@ -1,3 +0,0 @@
-export default {
-  uploading: '正在上传...'
-};