feat: field template manager

[TrigamDev]

Summary

• Replaces the field template chooser with one similar to the tag chooser, and adds a field template manager modal.
  • To do this, the tag chooser and tag managers have been merged, split into a view and controller, and had most functionality made generic (creating a SearchPanel and SearchPanelView). The new FieldTemplateSearchPanel and FieldTemplateSearchPanelView extend from these new classes.
• To better match the tag. translation keys that the tag search panel uses, the library.field. translation keys have been changed to field..
• Several new field. translation keys have been added to be used by the field template search panel.
• en has been correctly sorted (I ran a JSON sorter on it to make sure the new keys were correctly sorted, and found that existing keys weren't correctly sorted).

Note

This pull request does NOT implement creating, editing, or deleting field templates. Some inputs, such as "Create" buttons, are visible, but do nothing when interacted with.

Tasks Completed

• Platforms Tested:
  • Windows x86
  • Windows ARM
  • macOS x86
  • macOS ARM
  • Linux x86
  • Linux ARM
• Tested For:
  • Basic functionality
  • PyInstaller executable