sort: refine error handling and localize field parsing errors (uutils#10068)

* sort: refactor error handling and localize field parsing errors

* style(test): fix formatting and spell-checker ignore in sort tests

- Add 'dfgi' to spell-checker ignore list for accurate linting
- Reformat tuple and method call in test_conflict_check_out for consistency and to resolve clippy warnings

* refactor(sort): use Self::default() and remove unnecessary .into() in error handling

- Changed `ModeFlags::default()` to `Self::default()` for better idiomatic Rust code.
- Removed `.into()` call in `FieldSelector::from` method as it was redundant, simplifying error construction.

Author: mattsu2020

src/uu/sort/locales/en-US.ftl

@@ -32,6 +32,15 @@ sort-field-index-cannot-be-zero = field index can not be 0
 sort-failed-parse-char-index = failed to parse character index {$char}: {$error}
 sort-invalid-option = invalid option: '{$option}'
 sort-invalid-char-index-zero-start = invalid character index 0 for the start position of a field
+sort-invalid-field-spec = {$msg}: invalid field specification {$spec}
+sort-invalid-count-at-start-of = invalid count at start of {$string}
+sort-invalid-number-at-field-start = invalid number at field start
+sort-invalid-number-after-dash = invalid number after '-'
+sort-invalid-number-after-dot = invalid number after '.'
+sort-invalid-number-after-comma = invalid number after ','
+sort-field-number-is-zero = field number is zero
+sort-character-offset-is-zero = character offset is zero
+sort-stray-character-field-spec = stray character in field spec
 sort-invalid-batch-size-arg = invalid --batch-size argument '{$arg}'
 sort-minimum-batch-size-two = minimum --batch-size argument is '2'
 sort-batch-size-too-large = --batch-size argument {$arg} too large

src/uu/sort/locales/fr-FR.ftl

@@ -32,6 +32,15 @@ sort-field-index-cannot-be-zero = l'index de champ ne peut pas être 0
 sort-failed-parse-char-index = échec d'analyse de l'index de caractère {$char} : {$error}
 sort-invalid-option = option invalide : '{$option}'
 sort-invalid-char-index-zero-start = index de caractère 0 invalide pour la position de début d'un champ
+sort-invalid-field-spec = {$msg} : spécification de champ invalide {$spec}
+sort-invalid-count-at-start-of = nombre invalide au début de {$string}
+sort-invalid-number-at-field-start = nombre invalide au début du champ
+sort-invalid-number-after-dash = nombre invalide après '-'
+sort-invalid-number-after-dot = nombre invalide après '.'
+sort-invalid-number-after-comma = nombre invalide après ','
+sort-field-number-is-zero = le numéro de champ est zéro
+sort-character-offset-is-zero = le décalage de caractère est zéro
+sort-stray-character-field-spec = caractère parasite dans la spécification de champ
 sort-invalid-batch-size-arg = argument --batch-size invalide '{$arg}'
 sort-minimum-batch-size-two = l'argument --batch-size minimum est '2'
 sort-batch-size-too-large = argument --batch-size {$arg} trop grand