Fix link references in translated books

[Kissaki]

Fixes #1365

[Kissaki]

I have not built it locally, but the CI build confirms all warnings are gone.

• main job ref
• this PR job ref

resolved warnings

``` warning Broken links found in de/book/advanced.md: standard_library.md, dataframes.md, creating_errors.md, parallelism.md, explore.md warning Broken links found in de/book/coloring_and_theming.md: commands/ls.md warning Broken links found in de/book/coming_to_nu.md: coming_from_cmd.md, nushell_map.md, nushell_map_imperative.md, nushell_map_functional.md, nushell_operator_map.md warning Broken links found in de/book/custom_completions.md: externs.md, externs.md, ../cookbook/external_completers.md warning Broken links found in de/book/design_notes.md: how_nushell_code_gets_run.md warning Broken links found in de/book/environment.md: modules.md, modules.md, modules.md, /commands/docs/env.md, /commands/docs/env.md warning Broken links found in de/book/getting_started.md: quick_tour.md, thinking_in_nu.md warning Broken links found in de/book/hooks.md: /Befehle/docs/if.md warning Broken links found in de/book/loading_data.md: /commands/docs/size.md, /commands/docs/fetch.md warning Broken links found in de/book/nu_as_a_shell.md: stdout_stderr_exit_codes.md, shells_in_shells.md, line_editor.md, externs.md warning Broken links found in de/book/nu_fundamentals.md: pipelines.md warning Broken links found in de/book/overlays.md: modules.md, modules.md#environment-variables, /commands/docs/overlay_remove.md, /commands/docs/overlay_remove.md warning Broken links found in de/book/programming_in_nu.md: modules.md, testing.md warning Broken links found in de/book/working_with_strings.md: /commands/docs/str_rpad.md, /commands/docs/build-string.md warning Broken links found in ja/book/README.md: nu_fundamentals.md, programming_in_nu.md, nu_as_a_shell.md, coming_to_nu.md, design_notes.md, advanced.md warning Broken links found in ja/book/getting_started.md: thinking_in_nu.md warning Broken links found in ja/book/installation.md: book/dataframes.md warning Broken links found in ru/book/README.md: getting_started.md, nu_fundamentals.md, programming_in_nu.md, nu_as_a_shell.md, coming_to_nu.md, design_notes.md, advanced.md, dataframes.md warning Broken links found in zh-CN/book/dataframes.md: /commands/docs/dfr_join.md, /commands/docs/dfr_group-by.md, /commands/docs/dfr_take.md warning Broken links found in zh-CN/book/environment.md: /commands/docs/env.md, /commands/docs/env.md warning Broken links found in zh-CN/book/loading_data.md: /commands/docs/size.md, /commands/docs/fetch.md warning Broken links found in zh-CN/book/overlays.md: /commands/docs/overlay_add.md, /commands/docs/overlay_remove.md, /commands/docs/overlay_remove.md warning Broken links found in zh-CN/book/table_of_contents.md: thinking_in_nushell.md, pipeline.md warning Broken links found in zh-CN/book/working_with_strings.md: /commands/docs/str_lpad.md, /commands/docs/str_rpad.md, /commands/docs/build-string.md ```

[hustcer]

Excellent fix, Thanks