[Data] Adapt {span} prompts to custom input functionality

[nfelnlp]

There are a few prompts that are based on the notion of the string filter being part of the user question. However, we changed that recently to be handled by either the string filter input box next to the dataset viewer or the custom input dropdown option, so these prompts would have to be slightly adapted:

• global feature importance (not applicable)
• filter
  includes {span} -> includes
  When a string filter is used, the backend will use the filtered dataset as the temp_dataset.
  The user questions are modified slightly to allow for two kinds of formats:

1. The span is part of the question, i.e. a {span} placeholder
2. The span is not mentioned explicitly, but reffered to as "my query", "search term" or "filter", e.g. "Can you display all occurrences where my filter applies?"

• count data, label, show, statistic target
• likelihood, mistakes, score