fix: Clear fetched field when link field is cleared

fix(restore): Repopulate db_tables cache after database restore

This takes care of the following scenario.

During restore, before tabDefaultValue is created if a request/command executes frappe.db.get_tables, then the cached value db_tables is populated with partial list of tables.

bootstrap_database then checks if this partial list contains tabDefaultValue (as a sanity test to see if the restore worked). This check fails even though the database is correctly restored.

fix: use python _ instead of __

feat: Custom signup form hook

Co-authored-by: Gavin D'souza <gavin18d@gmail.com>
Co-authored-by: Suraj Shetty <13928957+surajshetty3416@users.noreply.github.com>

feat: SQL savepoints

feat: translations in Data Import

fix: default to 'en' if no language in settings

Co-authored-by: Suraj Shetty <surajshetty3416@gmail.com>
Co-authored-by: gavin <gavin18d@gmail.com>
Co-authored-by: Suraj Shetty <13928957+surajshetty3416@users.noreply.github.com>

Co-authored-by: Faris Ansari <netchampfaris@users.noreply.github.com>

This fixes an issue during installation of tests for erpnext in postgres - global settings

fix: misc setup_wizard region slide

feat: Half star rating (4.5 out of 5)

- Additional options were still selectable which could have got through
- Minor formatting changes

for consistency.

fix: wrong website generator import tag

fix: treeview expanding at random

feat: `before_uninstall` and `after_uninstall` hooks

fix: Escape matching pattern for substitution

Tested on PY3.9.7 and PY3.9.9

fix: value associated with property may be changed

fix: more button in multi-select dialog