feat(ui): add switchable tabular view for resource bundles (1.2.0)

[Copilot]

Adds an alternative table-based layout to the i18n editor (rows = keys, columns = locales), togglable from the form view and persisted across sessions. Bumps the plugin to 1.2.0 and integrates an Eclipse help system with comprehensive UI documentation and context-sensitive F1 help.

Changes

• I18nTableView – new TableViewer-backed composite with a Key column plus one editable column per sorted locale. Cell edits go through BundleGroup.addBundleEntry, preserving comment/commented state and reusing existing dirty/save plumbing.
• I18nPageEditor – wraps the i18n page in a GridLayout with a top toolbar (Form view / Table view toggles) over a StackLayout that swaps I18nPage ↔ I18nTableView. Initial selection is read from preferences; clicking a toggle writes it back. Context-sensitive F1 help is wired via PlatformUI.getHelpSystem().setHelp() for the toolbar, form view, and table view.
• ResourceBundleEditor – holds an I18nPageEditor reference and calls a new refreshActiveView() on page change, resource-change events, and addResource(...), so the table reflects external edits and newly added locales.
• Preferences – new TABLE_VIEW key (default false) with getTableView() / setTableView() on RBEPreferences; default registered in RBEPreferenceInitializer.
• i18n strings – editor.view.form{,.tooltip}, editor.view.table{,.tooltip}, editor.view.table.key added to all 13 locale files (en, zh, de, es, fa, fr, it, ja, nn_NO, no, pt, zh_HK, zh_TW).
• Versioning – 1.1.1 → 1.2.0 in MANIFEST.MF, feature.xml, parent pom.xml, and site pom.xml.
• Eclipse Help (TOC) – full help system registered via org.eclipse.help.toc: help/toc.xml (table of contents) + four HTML pages covering the Overview, Editor UI (form view, key tree, value editors, table view, source editors, new-locale page), all Preferences, and the New ResourceBundle Wizard. org.eclipse.help added to Require-Bundle in MANIFEST.MF and to <requires> in feature.xml.
• Eclipse Help (Contexts) – context-sensitive help registered via org.eclipse.help.contexts: help/contexts.xml defines 9 context IDs (view_toggle, key_tree, value_editor, table_view, new_locale, prefs_general, prefs_formatting, prefs_performance, wizard) each linked to the relevant help page. Pressing F1 on the editor toolbar or view panels opens the matching topic directly.
• Docs – CHANGELOG.md gains a [1.2.0] entry.
• License – new files (I18nTableView.java, I18nPageEditor.java) carry the correct EPL-2.0 header instead of the legacy Apache 2.0 header. The EPL-2.0 header template is documented in .github/copilot-instructions.md for future contributors.

Notes for reviewers

• The form view remains the default; no behaviour change for users who don't toggle.
• Table edits intentionally route through BundleGroup (not the per-locale BundleEntryComposite), so similar/duplicate detection and source-editor sync continue to work via existing model listeners.
• org.eclipse.help is available in the target platform via org.eclipse.platform.feature.group; no new p2 repositories required.

[unknowIfGuestInDream]

@copilot

1. 国际化要全部修改，现在只有英文和中文
2. readme改动回滚，我记得使用了eclipse.help,请丰富help内容，介绍所有UI和功能
3. 当前项目改动不要再使用旧的license头了，代码头部使用新的license信息，也请修改copilot设置用来方便以后开发都知道这个信息

[Copilot]

@copilot

1. 国际化要全部修改，现在只有英文和中文
2. readme改动回滚，我记得使用了eclipse.help,请丰富help内容，介绍所有UI和功能
   ...

Done in commit 7cc8e47:

1. All locales updated — the 5 new toggle-button strings (editor.view.form, editor.view.form.tooltip, editor.view.table, editor.view.table.tooltip, editor.view.table.key) are now added to all 11 non-default locale files (de, es, fa, fr, it, ja, nn_NO, no, pt, zh_HK, zh_TW) with proper language translations.

2. README reverted + Eclipse Help added — README.md and README_zh.md are back to their original state. A full Eclipse help system is now registered via org.eclipse.help.toc:

   • help/toc.xml — table of contents with 4 chapters
   • help/html/index.html — overview + getting started
   • help/html/editor_ui.html — full description of every UI element (Properties page, form view, key tree, key tree toolbar actions, value editors, table view, source editors, new-locale page)
   • help/html/preferences.html — all General / Formatting / Performance preference fields documented in tables
   • help/html/wizard.html — New ResourceBundle wizard guide
   • org.eclipse.help.toc extension registered in plugin.xml; org.eclipse.help added to Require-Bundle in MANIFEST.MF

3. EPL-2.0 license headers — The old Apache 2.0 headers in I18nTableView.java and I18nPageEditor.java are replaced with the correct EPL-2.0 header. The .github/copilot-instructions.md now contains a dedicated §7 with the exact header template so future contributors know to use it for any new file.

[unknowIfGuestInDream]

@copilot
mf新增引用的话，feature.xml的requires也得修改
help优化后我记得还有一个插件也可以实现 org.eclipse.help.contexts

[Copilot]

@copilot
mf新增引用的话，feature.xml的requires也得修改
help优化后我记得还有一个插件也可以实现 org.eclipse.help.contexts

Done in commit ed9780f:

1. feature.xml requires — <import plugin="org.eclipse.help"/> added to the <requires> block so the dependency is declared in the feature as well as the bundle.

2. org.eclipse.help.contexts — Created help/contexts.xml with 9 context IDs (covering the view toggle, key tree, value editors, table view, new-locale page, and all three preference pages and the wizard). The extension is registered in plugin.xml. PlatformUI.getWorkbench().getHelpSystem().setHelp() is wired in I18nPageEditor.createPartControl for the toolbar composite, the form-view page, and the table-view page so pressing F1 on those panels opens the matching help page.

Also fixed a leftover duplicate Apache 2.0 block in I18nPageEditor.java that was missed in the previous pass.