Ensure that adding new terms does not change the IDs of existing terms

[surchs]

At the moment it seems that the GDrive Spreadsheet we use auto-regenerates the values in the ID column if a user inserts a new row in the middle. This is no good, because this will change the ID of existing terms. See e.g. here:

f950817

We should

• Confirm this is a setting in Google Docs that causes the ID regeneration
• If so, see if we can turn the setting off
  • Some possible solutions:
    • In template, change format of id column in GSheet from "Automatic" to "Plain text"
    • Document that the id column should be a Plain text column as above
    • Always recommend that users add a ' instead of the ID to store it as a plain value (this should not be rendered or read by gspread)
• Or: document clearly that communities should only ever add rows at the bottom
• And: discuss with users what ordering they want for the terms in their spreadsheet (e.g. maybe ordered by ID column is not the most useful to them

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