fix: clarify gallery image download label

SHA256SUMS

@@ -128,7 +128,7 @@ d7d55b06ead173b4c23a277fa39800cadfc18f1163c500e8617cfc1f4ee0dea9  pigway_frame_f
 94558dbf524a1068e83283eb814c1b1501512d4b7e75e092b52e9aabfea720e7  pigway_frame_flow/web/favicon.ico
 0fa494a3fbd456c754bbea3f7f050be139e32e3b42b09a1ed953094087437210  pigway_frame_flow/web/favicon.svg
 1fac3bde40a6aa15701e9d2f02955575d0b180d2ffd7c2d299191bc1577aa87d  pigway_frame_flow/web/features.js
-70ff9f7bb9c26edad54452d5c4bea4eb5192106dcd00530419f12f38f245a585  pigway_frame_flow/web/i18n.js
+fe7c47c5de765b9611082f8336c33c74dc16333b983c05e48ac9658941489cd5  pigway_frame_flow/web/i18n.js
 51796b4db73773cea7e451ea21d3b493fcfaf340945d44a696b5d484a5222ea5  pigway_frame_flow/web/index.html
 0fa494a3fbd456c754bbea3f7f050be139e32e3b42b09a1ed953094087437210  pigway_frame_flow/web/logo-symbol.svg
 45ca22deabfa32d0133fca6c7da0d39ecf4e500b104c7f48678cb2ccd0956206  pigway_frame_flow/web/style.css

pigway_frame_flow/web/i18n.js

@@ -156,4 +156,4 @@ Object.assign(MESSAGES.en,{searchHistory:'Search image name, request ID, operati
 Object.assign(MESSAGES.zh,{excludePhoto:'不再选用',includePhoto:'恢复选用',photoExcluded:'已标记不再选用',excludePhotoHelp:'不再选用的图片将被后续自动选图和自动拼图跳过；图片不删除，星标独立保留，仍可手动使用或恢复选用。标记按图库独立保存。'});
 Object.assign(MESSAGES.en,{excludePhoto:'Exclude from selection',includePhoto:'Allow selection',photoExcluded:'Excluded from selection',excludePhotoHelp:'Excluded photos are skipped by future automatic selection and collages. Photos and stars are retained; manual use and restoring eligibility remain available. Preferences are saved separately per library.'});
 
-Object.assign(MESSAGES.zh,{downloadShort:'下载'});Object.assign(MESSAGES.en,{downloadShort:'Download'});
+Object.assign(MESSAGES.zh,{downloadShort:'下载图片'});Object.assign(MESSAGES.en,{downloadShort:'Download'});