UI: rename (✏️ Hide Columns) button to (✏️ Columns)

[akira69]

Summary

• Rename the list-table column toggle button label from "✏️Hide Columns" to "✏️Columns"
• keeps behavior unchanged; this clarifies that this control button toggles both show and hide - at first glance to this UI it was not clear to me. Hence this improvement.

Visualization

Old:

New:

Scope

• text-only UI clarification
• no backend changes
• no table behavior changes
• across all languages

Scope Mapping

• No dedicated upstream issue link or feature request was found for this improvement

Code Quality Compliance ✅

Per https://github.com/Donkie/Spoolman/wiki/Contribute#style

• ESLint (frontend): N/A - i18n changes only
• Prettier (frontend) ✓
• Ruff (backend): N/A
• Pre-commit hooks validated ✓

Note on Locale File Edits

Locale file edits typically go through Weblate to coordinate with community translations.
This PR is an exception: it's a UI string consolidation (removing "Hide" verb) rather than translation work. Future translation changes should use Weblate workflow.

Testing Performed

• Built frontend (npm ci && npm run build) and confirmed no build/type errors.
• Rebuilt PR UI: rename (✏️ Hide Columns) button to (✏️ Columns) #867 Docker image and redeployed a specific container along with spoolmanDB data.
• Verified button change across all pages (English) and button function
• Changed language to de and cs to confirm change on one page

Untested

• All languages across all pages (should not be necessary...)

Localization and Languages Details:

This PR updates only one key in each locale file:

• buttons.hideColumns: changed from a "Hide Columns" phrase to a simplified "Columns" label.

Updated locales (exact old → new):

• cs: Skrýt sloupce → Sloupce
• da: Skjul kolonner → Kolonner
• de: Spalten ausblenden → Spalten
• el: Απόκρυψη Στηλών → Στήλες
• en: Hide Columns → Columns
• es: Ocultar Columnas → Columnas
• et: Peida tulbad → Tulbad
• fa: مخفی کردن ستون → ستونها
• fr: Masquer les colonnes → Colonnes
• hu: Oszlopok elrejtése → Oszlopok
• it: Nascondi Colonna → Colonne
• ja: コラムを隠す → 列
• lt: Slėpti stulpelius → Stulpeliai
• nb-NO: Skjul kolonner → Kolonner
• nl: Kolommen verbergen → Kolommen
• pl: Edytuj kolumny → Kolumny
• pt: Ocultar Colunas → Colunas
• pt-BR: Ocultar Colunas → Colunas
• ro: ascunde coloane → Coloane
• ru: Скрыть столбцы → Столбцы
• sv: Dölj kolumner → Kolumner
• ta: நெடுவரிசைகளை மறைக்கவும் → நெடுவரிசைகள்
• th: ซ่อนคอลัมน์ → คอลัมน์
• tr: Sütunları gizle → Sütunlar
• uk: Приховати Стовпці → Колонки
• zh: 隐藏列 → 列
• zh-Hant: 隱藏欄 → 欄

Translation Coordination with #825

• This PR overlaps upstream #825 in shared locale files.
• Overlap is limited to translation JSON files.
• If #825 merges first:
  • rebase #867 and re-apply the simplified buttons.hideColumns → Columns wording in overlapping locales.
• If #867 merges first:
  • rebase #825 and preserve any unrelated Weblate translation updates while keeping the Columns wording where conflicts occur.
• Expected conflict scope is locale-string reconciliation only; no code or behavior conflict.