Standardize capitalization on actions in operations on taaxonomy

This a subtask of issue 421118 for a complete history and links to the other subtasks see #421118: [Meta] Standardize capitalization on actions

Lowercase action words are harder to translate. Many contributed modules, like Organic Groups and Views, already use uppercase action words.
To make this task more manageable we decided to split it on a module basis.

Proposed resolution

Change delete to Edit, list to List, add to Add, etc.

Remaining tasks

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