[birt-dev] CheckIn: Fix[Bugzilla] 136940,122873 and 139356

["Xiong Zhang" <xiong.zhang@xxxxxxxxxxx>]

-Summary:Fixed 3 bugs.

- Bugzilla Bug (s) Resolved:136940,122873 and 139356

- Description:
1.136940: Inconsistent capitalization in _expression_ Builder
2.122873: "floating footer" in master page is not supported now and it's better to be removed from GUI.
3:139356:Inconsistent title of image builder

- Tests Description: Manual

- Notes to Build Team:

- Notes to Developers:

- Notes to QA:

- Notes to Documentation:

- Files Added:

- Files Edited:

/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/nls/messages.properties
/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/views/attributes/page/HeaderFooterPage.java
/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ImageBuilder.java